diff --git a/McBopomofo.xcodeproj/project.pbxproj b/McBopomofo.xcodeproj/project.pbxproj
index 1a16216f..abeca958 100644
--- a/McBopomofo.xcodeproj/project.pbxproj
+++ b/McBopomofo.xcodeproj/project.pbxproj
@@ -50,6 +50,7 @@
 		D44FB74527915565003C80A6 /* Preferences.swift in Sources */ = {isa = PBXBuildFile; fileRef = D44FB74427915555003C80A6 /* Preferences.swift */; };
 		D44FB74727919D35003C80A6 /* EmacsKeyHelper.swift in Sources */ = {isa = PBXBuildFile; fileRef = D44FB74627919C83003C80A6 /* EmacsKeyHelper.swift */; };
 		D44FB74A2791B829003C80A6 /* VXHanConvert in Frameworks */ = {isa = PBXBuildFile; productRef = D44FB7492791B829003C80A6 /* VXHanConvert */; };
+		D44FB74D2792189A003C80A6 /* PhraseReplacementMap.cpp in Sources */ = {isa = PBXBuildFile; fileRef = D44FB74B2792189A003C80A6 /* PhraseReplacementMap.cpp */; };
 		D47F7DCE278BFB57002F9DD7 /* PreferencesWindowController.swift in Sources */ = {isa = PBXBuildFile; fileRef = D47F7DCD278BFB57002F9DD7 /* PreferencesWindowController.swift */; };
 		D47F7DD0278C0897002F9DD7 /* NonModalAlertWindowController.swift in Sources */ = {isa = PBXBuildFile; fileRef = D47F7DCF278C0897002F9DD7 /* NonModalAlertWindowController.swift */; };
 		D47F7DD3278C1263002F9DD7 /* UserOverrideModel.cpp in Sources */ = {isa = PBXBuildFile; fileRef = D47F7DD2278C1263002F9DD7 /* UserOverrideModel.cpp */; };
@@ -181,6 +182,8 @@
 		D44FB74427915555003C80A6 /* Preferences.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Preferences.swift; sourceTree = "<group>"; };
 		D44FB74627919C83003C80A6 /* EmacsKeyHelper.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = EmacsKeyHelper.swift; sourceTree = "<group>"; };
 		D44FB7482791B346003C80A6 /* VXHanConvert */ = {isa = PBXFileReference; lastKnownFileType = wrapper; name = VXHanConvert; path = Packages/VXHanConvert; sourceTree = "<group>"; };
+		D44FB74B2792189A003C80A6 /* PhraseReplacementMap.cpp */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.cpp.cpp; path = PhraseReplacementMap.cpp; sourceTree = "<group>"; };
+		D44FB74C2792189A003C80A6 /* PhraseReplacementMap.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = PhraseReplacementMap.h; sourceTree = "<group>"; };
 		D47F7DCD278BFB57002F9DD7 /* PreferencesWindowController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = PreferencesWindowController.swift; sourceTree = "<group>"; };
 		D47F7DCF278C0897002F9DD7 /* NonModalAlertWindowController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = NonModalAlertWindowController.swift; sourceTree = "<group>"; };
 		D47F7DD1278C1263002F9DD7 /* UserOverrideModel.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = UserOverrideModel.h; sourceTree = "<group>"; };
@@ -292,6 +295,8 @@
 				6ACC3D3C27914AAB00F1B140 /* KeyValueBlobReader.h */,
 				D41355DC278EA3ED005E5CBD /* UserPhrasesLM.cpp */,
 				D41355DD278EA3ED005E5CBD /* UserPhrasesLM.h */,
+				D44FB74B2792189A003C80A6 /* PhraseReplacementMap.cpp */,
+				D44FB74C2792189A003C80A6 /* PhraseReplacementMap.h */,
 				D41355D9278E6D17005E5CBD /* McBopomofoLM.cpp */,
 				D41355DA278E6D17005E5CBD /* McBopomofoLM.h */,
 				D47F7DD2278C1263002F9DD7 /* UserOverrideModel.cpp */,
@@ -589,6 +594,7 @@
 				D427F76C278CA2B0004A2160 /* AppDelegate.swift in Sources */,
 				D44FB74727919D35003C80A6 /* EmacsKeyHelper.swift in Sources */,
 				6A0D4ED315FC0D6400ABF4B3 /* main.m in Sources */,
+				D44FB74D2792189A003C80A6 /* PhraseReplacementMap.cpp in Sources */,
 				D44FB74527915565003C80A6 /* Preferences.swift in Sources */,
 				D47F7DD0278C0897002F9DD7 /* NonModalAlertWindowController.swift in Sources */,
 				D47F7DCE278BFB57002F9DD7 /* PreferencesWindowController.swift in Sources */,
diff --git a/Source/AppDelegate.swift b/Source/AppDelegate.swift
index 94e553ec..f93bf8b2 100644
--- a/Source/AppDelegate.swift
+++ b/Source/AppDelegate.swift
@@ -52,7 +52,8 @@ class AppDelegate: NSObject, NSApplicationDelegate, NonModalAlertWindowControlle
 
     func applicationDidFinishLaunching(_ notification: Notification) {
         LanguageModelManager.loadDataModels()
-        LanguageModelManager.loadUserPhrasesModel()
+        LanguageModelManager.loadUserPhrases()
+        LanguageModelManager.loadUserPhraseReplacement()
 
         if UserDefaults.standard.object(forKey: kCheckUpdateAutomatically) == nil {
             UserDefaults.standard.set(true, forKey: kCheckUpdateAutomatically)
diff --git a/Source/Engine/McBopomofoLM.cpp b/Source/Engine/McBopomofoLM.cpp
index 3d577fd2..ea85c2dc 100644
--- a/Source/Engine/McBopomofoLM.cpp
+++ b/Source/Engine/McBopomofoLM.cpp
@@ -37,6 +37,7 @@ McBopomofoLM::~McBopomofoLM()
     m_languageModel.close();
     m_userPhrases.close();
     m_excludedPhrases.close();
+    m_phraseReplacement.close();
 }
 
 void McBopomofoLM::loadLanguageModel(const char* languageModelDataPath)
@@ -60,6 +61,13 @@ void McBopomofoLM::loadUserPhrases(const char* userPhrasesDataPath,
     }
 }
 
+void McBopomofoLM::loadPhraseReplacementMap(const char* phraseReplacementPath) {
+    if (phraseReplacementPath) {
+        m_phraseReplacement.close();
+        m_phraseReplacement.open(phraseReplacementPath);
+    }
+}
+
 const vector<Bigram> McBopomofoLM::bigramsForKeys(const string& preceedingKey, const string& key)
 {
     return vector<Bigram>();
@@ -83,24 +91,45 @@ const vector<Unigram> McBopomofoLM::unigramsForKey(const string& key)
 
     if (m_userPhrases.hasUnigramsForKey(key)) {
         vector<Unigram> rawUserUnigrams = m_userPhrases.unigramsForKey(key);
+        vector<Unigram> filterredUserUnigrams = m_userPhrases.unigramsForKey(key);
 
         for (auto&& unigram : rawUserUnigrams) {
             if (excludedValues.find(unigram.keyValue.value) == excludedValues.end()) {
-                userUnigrams.push_back(unigram);
+                filterredUserUnigrams.push_back(unigram);
             }
         }
 
-        transform(userUnigrams.begin(), userUnigrams.end(),
+        transform(filterredUserUnigrams.begin(), filterredUserUnigrams.end(),
                   inserter(userValues, userValues.end()),
                   [](const Unigram &u) { return u.keyValue.value; });
+
+        if (m_phraseReplacementEnabled) {
+            for (auto&& unigram : filterredUserUnigrams) {
+                string value = unigram.keyValue.value;
+                string replacement = m_phraseReplacement.valueForKey(value);
+                if (replacement != "") {
+                    unigram.keyValue.value = replacement;
+                }
+                unigrams.push_back(unigram);
+            }
+        } else {
+            unigrams = filterredUserUnigrams;
+        }
     }
 
     if (m_languageModel.hasUnigramsForKey(key)) {
         vector<Unigram> globalUnigrams = m_languageModel.unigramsForKey(key);
 
         for (auto&& unigram : globalUnigrams) {
-            if (excludedValues.find(unigram.keyValue.value) == excludedValues.end() &&
-                userValues.find(unigram.keyValue.value) == userValues.end()) {
+            string value = unigram.keyValue.value;
+            if (excludedValues.find(value) == excludedValues.end() &&
+                userValues.find(value) == userValues.end()) {
+                if (m_phraseReplacementEnabled) {
+                    string replacement = m_phraseReplacement.valueForKey(value);
+                    if (replacement != "") {
+                        unigram.keyValue.value = replacement;
+                    }
+                }
                 unigrams.push_back(unigram);
             }
         }
@@ -119,3 +148,14 @@ bool McBopomofoLM::hasUnigramsForKey(const string& key)
 
     return unigramsForKey(key).size() > 0;
 }
+
+void McBopomofoLM::setPhraseReplacementEnabled(bool enabled)
+{
+    m_phraseReplacementEnabled = enabled;
+}
+
+bool McBopomofoLM::phraseReplacementEnabled()
+{
+    return m_phraseReplacementEnabled;
+}
+
diff --git a/Source/Engine/McBopomofoLM.h b/Source/Engine/McBopomofoLM.h
index 82b02f0d..46e28e2a 100644
--- a/Source/Engine/McBopomofoLM.h
+++ b/Source/Engine/McBopomofoLM.h
@@ -27,6 +27,7 @@
 #include <stdio.h>
 #include "FastLM.h"
 #include "UserPhrasesLM.h"
+#include "PhraseReplacementMap.h"
 
 namespace McBopomofo {
 
@@ -38,17 +39,23 @@ public:
     ~McBopomofoLM();
 
     void loadLanguageModel(const char* languageModelDataPath);
-    void loadUserPhrases(const char* m_userPhrasesDataPath,
-                         const char* m_excludedPhrasesDataPath);
+    void loadUserPhrases(const char* userPhrasesDataPath,
+                         const char* excludedPhrasesDataPath);
+    void loadPhraseReplacementMap(const char* phraseReplacementPath);
 
     const vector<Bigram> bigramsForKeys(const string& preceedingKey, const string& key);
     const vector<Unigram> unigramsForKey(const string& key);
     bool hasUnigramsForKey(const string& key);
 
+    void setPhraseReplacementEnabled(bool enabled);
+    bool phraseReplacementEnabled();
+
 protected:
     FastLM m_languageModel;
     UserPhrasesLM m_userPhrases;
     UserPhrasesLM m_excludedPhrases;
+    PhraseReplacementMap m_phraseReplacement;
+    bool m_phraseReplacementEnabled;
 };
 };
 
diff --git a/Source/Engine/PhraseReplacementMap.cpp b/Source/Engine/PhraseReplacementMap.cpp
new file mode 100644
index 00000000..c0c3abbe
--- /dev/null
+++ b/Source/Engine/PhraseReplacementMap.cpp
@@ -0,0 +1,91 @@
+#include "PhraseReplacementMap.h"
+
+#include <sys/mman.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <fstream>
+#include <unistd.h>
+
+#include "KeyValueBlobReader.h"
+
+namespace McBopomofo {
+
+using std::string;
+
+PhraseReplacementMap::PhraseReplacementMap()
+: fd(-1)
+, data(0)
+, length(0)
+{
+}
+
+PhraseReplacementMap::~PhraseReplacementMap()
+{
+    if (data) {
+        close();
+    }
+}
+
+bool PhraseReplacementMap::open(const char *path)
+{
+    if (data) {
+        return false;
+    }
+
+    fd = ::open(path, O_RDONLY);
+    if (fd == -1) {
+        printf("open:: file not exist");
+        return false;
+    }
+
+    struct stat sb;
+    if (fstat(fd, &sb) == -1) {
+        printf("open:: cannot open file");
+        return false;
+    }
+
+    length = (size_t)sb.st_size;
+
+    data = mmap(NULL, length, PROT_READ, MAP_SHARED, fd, 0);
+    if (!data) {
+        ::close(fd);
+        return false;
+    }
+
+    KeyValueBlobReader reader(static_cast<char*>(data), length);
+    KeyValueBlobReader::KeyValue keyValue;
+    KeyValueBlobReader::State state;
+    while ((state = reader.Next(&keyValue)) == KeyValueBlobReader::State::HAS_PAIR) {
+        keyValueMap[keyValue.key] = keyValue.value;
+    }
+
+    if (state == KeyValueBlobReader::State::ERROR) {
+        close();
+        return false;
+    }
+    return true;
+}
+
+void PhraseReplacementMap::close()
+{
+    if (data) {
+        munmap(data, length);
+        ::close(fd);
+        data = 0;
+    }
+
+    keyValueMap.clear();
+}
+
+const std::string PhraseReplacementMap::valueForKey(const std::string& key)
+{
+    auto iter = keyValueMap.find(key);
+    if (iter != keyValueMap.end()) {
+        const std::string_view v = iter->second;
+        return {v.data(), v.size()};
+    }
+    return string("");
+}
+
+
+}
diff --git a/Source/Engine/PhraseReplacementMap.h b/Source/Engine/PhraseReplacementMap.h
new file mode 100644
index 00000000..d58d7c17
--- /dev/null
+++ b/Source/Engine/PhraseReplacementMap.h
@@ -0,0 +1,29 @@
+#ifndef PHRASEREPLACEMENTMAP_H
+#define PHRASEREPLACEMENTMAP_H
+
+#include <string>
+#include <map>
+#include <iostream>
+
+namespace McBopomofo {
+
+class PhraseReplacementMap
+{
+public:
+    PhraseReplacementMap();
+    ~PhraseReplacementMap();
+
+    bool open(const char *path);
+    void close();
+    const std::string valueForKey(const std::string& key);
+
+protected:
+    std::map<std::string_view, std::string_view> keyValueMap;
+    int fd;
+    void *data;
+    size_t length;
+};
+
+}
+
+#endif
diff --git a/Source/InputMethodController.mm b/Source/InputMethodController.mm
index 1b6ce782..762e7665 100644
--- a/Source/InputMethodController.mm
+++ b/Source/InputMethodController.mm
@@ -142,6 +142,7 @@ static double FindHighestScore(const vector<NodeAnchor>& nodes, double epsilon)
 
         // create the lattice builder
         _languageModel = [LanguageModelManager languageModelMcBopomofo];
+        _languageModel->setPhraseReplacementEnabled(Preferences.phraseReplacementEnabled);
         _userOverrideModel = [LanguageModelManager userOverrideModel];
 
         _builder = new BlockReadingBuilder(_languageModel);
@@ -165,14 +166,19 @@ static double FindHighestScore(const vector<NodeAnchor>& nodes, double epsilon)
 
     [menu addItemWithTitle:NSLocalizedString(@"McBopomofo Preferences", @"") action:@selector(showPreferences:) keyEquivalent:@""];
 
-    NSMenuItem *chineseConversionMenuItem = [[NSMenuItem alloc] initWithTitle:NSLocalizedString(@"Chinese Conversion", @"") action:@selector(toggleChineseConverter:) keyEquivalent:@"g"];
+    NSMenuItem *chineseConversionMenuItem = [menu addItemWithTitle:NSLocalizedString(@"Chinese Conversion", @"") action:@selector(toggleChineseConverter:) keyEquivalent:@"g"];
     chineseConversionMenuItem.keyEquivalentModifierMask = NSEventModifierFlagCommand | NSEventModifierFlagControl;
     chineseConversionMenuItem.state = Preferences.chineseConversionEnabled ? NSControlStateValueOn : NSControlStateValueOff;
-    [menu addItem:chineseConversionMenuItem];
 
-    NSMenuItem *halfWidthPunctuationMenuItem = [[NSMenuItem alloc] initWithTitle:NSLocalizedString(@"Use Half-Width Punctuations", @"") action:@selector(toggleHalfWidthPunctuation:) keyEquivalent:@""];
+    NSMenuItem *halfWidthPunctuationMenuItem = [menu addItemWithTitle:NSLocalizedString(@"Use Half-Width Punctuations", @"") action:@selector(toggleHalfWidthPunctuation:) keyEquivalent:@""];
     halfWidthPunctuationMenuItem.state = Preferences.halfWidthPunctuationEnabled ? NSControlStateValueOn : NSControlStateValueOff;
-    [menu addItem:halfWidthPunctuationMenuItem];
+
+    BOOL optionKeyPressed = [[NSEvent class] respondsToSelector:@selector(modifierFlags)] && ([NSEvent modifierFlags] & NSAlternateKeyMask);
+
+    if (_inputMode == kBopomofoModeIdentifier && optionKeyPressed) {
+        NSMenuItem *phaseReplacementMenuItem = [menu addItemWithTitle:NSLocalizedString(@"Use Phrase Replacement", @"") action:@selector(togglePhraseReplacementEnabled:) keyEquivalent:@""];
+        phaseReplacementMenuItem.state = Preferences.phraseReplacementEnabled ? NSControlStateValueOn : NSControlStateValueOff;
+    }
 
     [menu addItem:[NSMenuItem separatorItem]];
     [menu addItemWithTitle:NSLocalizedString(@"User Phrases", @"") action:NULL keyEquivalent:@""];
@@ -183,6 +189,9 @@ static double FindHighestScore(const vector<NodeAnchor>& nodes, double epsilon)
     else {
         [menu addItemWithTitle:NSLocalizedString(@"Edit User Phrases", @"") action:@selector(openUserPhrases:) keyEquivalent:@""];
         [menu addItemWithTitle:NSLocalizedString(@"Edit Excluded Phrases", @"") action:@selector(openExcludedPhrasesMcBopomofo:) keyEquivalent:@""];
+        if (optionKeyPressed) {
+            [menu addItemWithTitle:NSLocalizedString(@"Edit Phrase Replacement Table", @"") action:@selector(openPhraseReplacementMcBopomofo:) keyEquivalent:@""];
+        }
     }
     [menu addItemWithTitle:NSLocalizedString(@"Reload User Phrases", @"") action:@selector(reloadUserPhrases:) keyEquivalent:@""];
     [menu addItem:[NSMenuItem separatorItem]];
@@ -270,6 +279,7 @@ static double FindHighestScore(const vector<NodeAnchor>& nodes, double epsilon)
     else {
         newInputMode = kBopomofoModeIdentifier;
         newLanguageModel = [LanguageModelManager languageModelMcBopomofo];
+        newLanguageModel->setPhraseReplacementEnabled(Preferences.phraseReplacementEnabled);
     }
 
     // Only apply the changes if the value is changed
@@ -1481,6 +1491,30 @@ NS_INLINE size_t max(size_t a, size_t b) { return a > b ? a : b; }
     [[NSApplication sharedApplication] activateIgnoringOtherApps:YES];
 }
 
+- (void)toggleChineseConverter:(id)sender
+{
+    BOOL chineseConversionEnabled = [Preferences toggleChineseConversionEnabled];
+    [NotifierController notifyWithMessage:
+     chineseConversionEnabled ?
+     NSLocalizedString(@"Chinese conversion on", @"") :
+     NSLocalizedString(@"Chinese conversion off", @"") stay:NO];
+}
+
+- (void)toggleHalfWidthPunctuation:(id)sender
+{
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wunused-result"
+    [Preferences tooglePhraseReplacementEnabled];
+#pragma GCC diagnostic pop
+}
+
+- (void)togglePhraseReplacementEnabled:(id)sender
+{
+    BOOL enabled = [Preferences tooglePhraseReplacementEnabled];
+    McBopomofoLM *lm = [LanguageModelManager languageModelMcBopomofo];
+    lm->setPhraseReplacementEnabled(enabled);
+}
+
 - (void)checkForUpdate:(id)sender
 {
     [(AppDelegate *)[[NSApplication sharedApplication] delegate] checkForUpdateForced:YES];
@@ -1521,9 +1555,15 @@ NS_INLINE size_t max(size_t a, size_t b) { return a > b ? a : b; }
     [self _openUserFile:[LanguageModelManager excludedPhrasesDataPathMcBopomofo]];
 }
 
+- (void)openPhraseReplacementMcBopomofo:(id)sender
+{
+    [self _openUserFile:[LanguageModelManager phraseReplacementDataPathMcBopomofo]];
+}
+
 - (void)reloadUserPhrases:(id)sender
 {
-    [LanguageModelManager loadUserPhrasesModel];
+    [LanguageModelManager loadUserPhrases];
+    [LanguageModelManager loadUserPhraseReplacement];
 }
 
 - (void)showAbout:(id)sender
@@ -1532,22 +1572,7 @@ NS_INLINE size_t max(size_t a, size_t b) { return a > b ? a : b; }
     [[NSApplication sharedApplication] activateIgnoringOtherApps:YES];
 }
 
-- (void)toggleChineseConverter:(id)sender
-{
-    BOOL chineseConversionEnabled = [Preferences toggleChineseConversionEnabled];
-    [NotifierController notifyWithMessage:
-     chineseConversionEnabled ?
-        NSLocalizedString(@"Chinese conversion on", @"") :
-        NSLocalizedString(@"Chinese conversion off", @"") stay:NO];
-}
 
-- (void)toggleHalfWidthPunctuation:(id)sender
-{
-#pragma GCC diagnostic push
-#pragma GCC diagnostic ignored "-Wunused-result"
-    [Preferences toogleHalfWidthPunctuationEnabled];
-#pragma GCC diagnostic pop
-}
 
 @end
 
diff --git a/Source/LanguageModelManager.h b/Source/LanguageModelManager.h
index d819e067..455d9b18 100644
--- a/Source/LanguageModelManager.h
+++ b/Source/LanguageModelManager.h
@@ -8,7 +8,8 @@ NS_ASSUME_NONNULL_BEGIN
 @interface LanguageModelManager : NSObject
 
 + (void)loadDataModels;
-+ (void)loadUserPhrasesModel;
++ (void)loadUserPhrases;
++ (void)loadUserPhraseReplacement;
 + (BOOL)checkIfUserLanguageModelFilesExist;
 + (BOOL)writeUserPhrase:(NSString *)userPhrase;
 
@@ -16,6 +17,7 @@ NS_ASSUME_NONNULL_BEGIN
 @property (class, readonly, nonatomic) NSString *userPhrasesDataPathMcBopomofo;
 @property (class, readonly, nonatomic) NSString *excludedPhrasesDataPathMcBopomofo;
 @property (class, readonly, nonatomic) NSString *excludedPhrasesDataPathPlainBopomofo;
+@property (class, readonly, nonatomic) NSString *phraseReplacementDataPathMcBopomofo;
 @property (class, readonly, nonatomic) McBopomofo::McBopomofoLM *languageModelMcBopomofo;
 @property (class, readonly, nonatomic) McBopomofo::McBopomofoLM *languageModelPlainBopomofo;
 @property (class, readonly, nonatomic) McBopomofo::UserOverrideModel *userOverrideModel;
diff --git a/Source/LanguageModelManager.mm b/Source/LanguageModelManager.mm
index 51951041..189e2eb6 100644
--- a/Source/LanguageModelManager.mm
+++ b/Source/LanguageModelManager.mm
@@ -32,12 +32,17 @@ static void LTLoadLanguageModelFile(NSString *filenameWithoutExtension, McBopomo
     LTLoadLanguageModelFile(@"data-plain-bpmf", gLanguageModelPlainBopomofo);
 }
 
-+ (void)loadUserPhrasesModel
++ (void)loadUserPhrases
 {
     gLanguageModelMcBopomofo.loadUserPhrases([[self userPhrasesDataPathMcBopomofo] UTF8String], [[self excludedPhrasesDataPathMcBopomofo] UTF8String]);
     gLanguageModelPlainBopomofo.loadUserPhrases(NULL, [[self excludedPhrasesDataPathPlainBopomofo] UTF8String]);
 }
 
++ (void)loadUserPhraseReplacement
+{
+    gLanguageModelMcBopomofo.loadPhraseReplacementMap([[self phraseReplacementDataPathMcBopomofo] UTF8String]);
+}
+
 + (BOOL)checkIfUserDataFolderExists
 {
     NSString *folderPath = [self dataFolderPath];
@@ -89,6 +94,9 @@ static void LTLoadLanguageModelFile(NSString *filenameWithoutExtension, McBopomo
     if (![self checkIfFileExist:[self excludedPhrasesDataPathPlainBopomofo]]) {
         return NO;
     }
+    if (![self checkIfFileExist:[self phraseReplacementDataPathMcBopomofo]]) {
+        return NO;
+    }
     return YES;
 }
 
@@ -135,7 +143,7 @@ static void LTLoadLanguageModelFile(NSString *filenameWithoutExtension, McBopomo
     [writeFile writeData:data];
     [writeFile closeFile];
 
-    [self loadUserPhrasesModel];
+    [self loadUserPhrases];
     return YES;
 }
 
@@ -162,6 +170,11 @@ static void LTLoadLanguageModelFile(NSString *filenameWithoutExtension, McBopomo
     return [[self dataFolderPath] stringByAppendingPathComponent:@"exclude-phrases-plain-bpmf.txt"];
 }
 
++ (NSString *)phraseReplacementDataPathMcBopomofo
+{
+    return [[self dataFolderPath] stringByAppendingPathComponent:@"phrases-replacement.txt"];
+}
+
  + (McBopomofoLM *)languageModelMcBopomofo
 {
     return &gLanguageModelMcBopomofo;
diff --git a/Source/McBopomofo-Bridging-Header.h b/Source/McBopomofo-Bridging-Header.h
index 084274e7..8310cc67 100644
--- a/Source/McBopomofo-Bridging-Header.h
+++ b/Source/McBopomofo-Bridging-Header.h
@@ -6,5 +6,6 @@
 
 @interface LanguageModelManager : NSObject
 + (void)loadDataModels;
-+ (void)loadUserPhrasesModel;
++ (void)loadUserPhrases;
++ (void)loadUserPhraseReplacement;
 @end
diff --git a/Source/Preferences.swift b/Source/Preferences.swift
index ea5e4021..e1f2303c 100644
--- a/Source/Preferences.swift
+++ b/Source/Preferences.swift
@@ -51,6 +51,7 @@ private let kCandidateTextFontName = "CandidateTextFontName"
 private let kCandidateKeyLabelFontName = "CandidateKeyLabelFontName"
 private let kCandidateKeys = "CandidateKeys"
 private let kChineseConversionEngineKey = "ChineseConversionEngine"
+private let kPhraseReplacementEnabledKey = "PhraseReplacementEnabled"
 
 private let kDefaultCandidateListTextSize: CGFloat = 16
 private let kMinKeyLabelSize: CGFloat = 10
@@ -291,4 +292,12 @@ class Preferences: NSObject {
         return ChineseConversionEngine(rawValue: chineneConversionEngine)?.name
     }
 
+    @UserDefault(key: kPhraseReplacementEnabledKey, defaultValue: false)
+    @objc static var phraseReplacementEnabled: Bool
+
+    @objc static func tooglePhraseReplacementEnabled() -> Bool {
+        phraseReplacementEnabled = !phraseReplacementEnabled
+        return phraseReplacementEnabled;
+    }
+
 }
diff --git a/Source/en.lproj/Localizable.strings b/Source/en.lproj/Localizable.strings
index 7aa8d586..2f07e92d 100644
--- a/Source/en.lproj/Localizable.strings
+++ b/Source/en.lproj/Localizable.strings
@@ -72,3 +72,7 @@
 "Chinese conversion on" = "Chinese conversion on";
 
 "Chinese conversion off" = "Chinese conversion off";
+
+"Edit Phrase Replacement Table" = "Edit Phrase Replacement Table";
+
+"Use Phrase Replacement" = "Use Phrase Replacement";
diff --git a/Source/zh-Hant.lproj/Localizable.strings b/Source/zh-Hant.lproj/Localizable.strings
index 98664234..c68a3e42 100644
--- a/Source/zh-Hant.lproj/Localizable.strings
+++ b/Source/zh-Hant.lproj/Localizable.strings
@@ -72,3 +72,7 @@
 "Chinese conversion on" = "已經切換到簡體中文模式";
 
 "Chinese conversion off" = "已經切換到繁體中文模式";
+
+"Edit Phrase Replacement Table" = "編輯詞彙替換表格";
+
+"Use Phrase Replacement" = "使用詞彙替換";