diff --git a/Source/Modules/ControllerModules/KeyHandler.mm b/Source/Modules/ControllerModules/KeyHandler.mm
index fe523f9a..9797a6fa 100644
--- a/Source/Modules/ControllerModules/KeyHandler.mm
+++ b/Source/Modules/ControllerModules/KeyHandler.mm
@@ -97,21 +97,26 @@ static NSString *const kGraphVizOutputfile = @"/tmp/vChewing-visualization.dot";
 {
     NSString *newInputMode;
     vChewingLM *newLanguageModel;
+    UserOverrideModel *newUserOverrideModel;
 
     if ([value isKindOfClass:[NSString class]] && [value isEqual:imeModeCHS]) {
         newInputMode = imeModeCHS;
         newLanguageModel = [mgrLangModel lmCHS];
-        newLanguageModel->setPhraseReplacementEnabled(false);
+        newUserOverrideModel = [mgrLangModel userOverrideModelCHS];
     } else {
         newInputMode = imeModeCHT;
         newLanguageModel = [mgrLangModel lmCHT];
-        newLanguageModel->setPhraseReplacementEnabled(Preferences.phraseReplacementEnabled);
+        newUserOverrideModel = [mgrLangModel userOverrideModelCHT];
     }
 
+    // Symchronize the Preference Setting "setPhraseReplacementEnabled" to the new LM.
+    newLanguageModel->setPhraseReplacementEnabled(Preferences.phraseReplacementEnabled);
+
     // Only apply the changes if the value is changed
     if (![_inputMode isEqualToString:newInputMode]) {
         _inputMode = newInputMode;
         _languageModel = newLanguageModel;
+        _userOverrideModel = newUserOverrideModel;
 
         if (_builder) {
             delete _builder;
@@ -146,7 +151,7 @@ static NSString *const kGraphVizOutputfile = @"/tmp/vChewing-visualization.dot";
         // create the lattice builder
         _languageModel = [mgrLangModel lmCHT];
         _languageModel->setPhraseReplacementEnabled(Preferences.phraseReplacementEnabled);
-        _userOverrideModel = [mgrLangModel userOverrideModel];
+        _userOverrideModel = [mgrLangModel userOverrideModelCHT];
 
         _builder = new BlockReadingBuilder(_languageModel);
 
@@ -190,7 +195,7 @@ static NSString *const kGraphVizOutputfile = @"/tmp/vChewing-visualization.dot";
     size_t cursorIndex = [self _actualCandidateCursorIndex];
     string stringValue = [value UTF8String];
     _builder->grid().fixNodeSelectedCandidate(cursorIndex, stringValue);
-    if (_inputMode != imeModeCHS) {
+    if (!Preferences.useSCPCTypingMode) { // 不要針對逐字選字模式啟用臨時半衰記憶模型。
         _userOverrideModel->observe(_walkedNodes, cursorIndex, stringValue, [[NSDate date] timeIntervalSince1970]);
     }
     [self _walk];
diff --git a/Source/Modules/IMEModules/ctlInputMethod.swift b/Source/Modules/IMEModules/ctlInputMethod.swift
index 13cc180a..6fcbf635 100644
--- a/Source/Modules/IMEModules/ctlInputMethod.swift
+++ b/Source/Modules/IMEModules/ctlInputMethod.swift
@@ -224,8 +224,7 @@ class ctlInputMethod: IMKInputController {
     }
 
     @objc func togglePhraseReplacement(_ sender: Any?) {
-        let enabled = Preferences.togglePhraseReplacementEnabled()
-        mgrLangModel.phraseReplacementEnabled = enabled
+        mgrLangModel.setPhraseReplacementEnabled(Preferences.togglePhraseReplacementEnabled())
     }
 
     @objc func selfTerminate(_ sender: Any?) {
@@ -253,15 +252,15 @@ class ctlInputMethod: IMKInputController {
     }
 
     @objc func openUserPhrases(_ sender: Any?) {
-        open(userFileAt: mgrLangModel.userPhrasesDataPathCHT)
+        open(userFileAt: mgrLangModel.userPhrasesDataPath(keyHandler.inputMode))
     }
 
     @objc func openExcludedPhrases(_ sender: Any?) {
-        open(userFileAt: mgrLangModel.excludedPhrasesDataPathCHT)
+        open(userFileAt: mgrLangModel.excludedPhrasesDataPath(keyHandler.inputMode))
     }
 
     @objc func openPhraseReplacement(_ sender: Any?) {
-        open(userFileAt: mgrLangModel.phraseReplacementDataPathCHT)
+        open(userFileAt: mgrLangModel.phraseReplacementDataPath(keyHandler.inputMode))
     }
 
     @objc func reloadUserPhrases(_ sender: Any?) {
@@ -554,7 +553,7 @@ extension ctlInputMethod: KeyHandlerDelegate {
         if !state.validToWrite {
             return false
         }
-        mgrLangModel.writeUserPhrase(state.userPhrase)
+        mgrLangModel.writeUserPhrase(state.userPhrase, inputMode: keyHandler.inputMode)
         return true
     }
 }
diff --git a/Source/Modules/LangModelRelated/mgrLangModel.h b/Source/Modules/LangModelRelated/mgrLangModel.h
index e918eb84..df19d4cf 100644
--- a/Source/Modules/LangModelRelated/mgrLangModel.h
+++ b/Source/Modules/LangModelRelated/mgrLangModel.h
@@ -31,16 +31,16 @@ NS_ASSUME_NONNULL_BEGIN
 + (BOOL)checkIfUserLanguageModelFilesExist;
 
 + (BOOL)checkIfUserPhraseExist:(NSString *)userPhrase key:(NSString *)key NS_SWIFT_NAME(checkIfExist(userPhrase:key:));
-+ (BOOL)writeUserPhrase:(NSString *)userPhrase;
++ (BOOL)writeUserPhrase:(NSString *)userPhrase inputMode:(InputMode)mode;
++ (void)setPhraseReplacementEnabled:(BOOL)phraseReplacementEnabled;
++ (BOOL)cnsEnabled:(InputMode)mode;
++ (void)setCNSEnabled:(BOOL)cnsEnabled inputMode:(InputMode)mode;
++ (NSString *)userPhrasesDataPath:(InputMode)mode;
++ (NSString *)excludedPhrasesDataPath:(InputMode)mode;
++ (NSString *)phraseReplacementDataPath:(InputMode)mode;
 
 @property (class, readonly, nonatomic) NSString *dataFolderPath;
-@property (class, readonly, nonatomic) NSString *userPhrasesDataPathCHT;
-@property (class, readonly, nonatomic) NSString *userPhrasesDataPathCHS;
-@property (class, readonly, nonatomic) NSString *excludedPhrasesDataPathCHT;
-@property (class, readonly, nonatomic) NSString *excludedPhrasesDataPathCHS;
-@property (class, readonly, nonatomic) NSString *phraseReplacementDataPathCHT;
-@property (class, readonly, nonatomic) NSString *phraseReplacementDataPathCHS;
-@property (class, assign, nonatomic) BOOL phraseReplacementEnabled;
+@property (class, readonly, nonatomic) NSString *cnsDataPath;
 
 @end
 
diff --git a/Source/Modules/LangModelRelated/mgrLangModel.mm b/Source/Modules/LangModelRelated/mgrLangModel.mm
index 01745a6c..5a75fbc7 100644
--- a/Source/Modules/LangModelRelated/mgrLangModel.mm
+++ b/Source/Modules/LangModelRelated/mgrLangModel.mm
@@ -29,7 +29,8 @@ static const double kObservedOverrideHalflife = 5400.0;
 
 static vChewingLM gLangModelCHT;
 static vChewingLM gLangModelCHS;
-static UserOverrideModel gUserOverrideModel(kUserOverrideModelCapacity, kObservedOverrideHalflife);
+static UserOverrideModel gUserOverrideModelCHT(kUserOverrideModelCapacity, kObservedOverrideHalflife);
+static UserOverrideModel gUserOverrideModelCHS(kUserOverrideModelCapacity, kObservedOverrideHalflife);
 
 static NSString *const kUserDataTemplateName = @"template-data";
 static NSString *const kExcludedPhrasesvChewingTemplateName = @"template-exclude-phrases";
@@ -71,6 +72,9 @@ static void LTLoadAssociatedPhrases(vChewingLM &lm)
         if (!gLangModelCHT.isDataModelLoaded()) {
             LTLoadLanguageModelFile(@"data-cht", gLangModelCHT);
         }
+        if (!gLangModelCHT.isAssociatedPhrasesLoaded()) {
+            LTLoadAssociatedPhrases(gLangModelCHT);
+        }
     }
 
     if ([mode isEqualToString:imeModeCHS]) {
@@ -85,13 +89,14 @@ static void LTLoadAssociatedPhrases(vChewingLM &lm)
 
 + (void)loadUserPhrases
 {
-    gLangModelCHT.loadUserPhrases([[self userPhrasesDataPathCHT] UTF8String], [[self excludedPhrasesDataPathCHT] UTF8String]);
-    gLangModelCHS.loadUserPhrases([[self userPhrasesDataPathCHS] UTF8String], [[self excludedPhrasesDataPathCHS] UTF8String]);
+    gLangModelCHT.loadUserPhrases([[self userPhrasesDataPath:imeModeCHT] UTF8String], [[self excludedPhrasesDataPath:imeModeCHT] UTF8String]);
+    gLangModelCHS.loadUserPhrases([[self userPhrasesDataPath:imeModeCHS] UTF8String], [[self excludedPhrasesDataPath:imeModeCHS] UTF8String]);
 }
 
 + (void)loadUserPhraseReplacement
 {
-    gLangModelCHT.loadPhraseReplacementMap([[self phraseReplacementDataPathCHT] UTF8String]);
+    gLangModelCHT.loadPhraseReplacementMap([[self phraseReplacementDataPath:imeModeCHT] UTF8String]);
+    gLangModelCHS.loadPhraseReplacementMap([[self phraseReplacementDataPath:imeModeCHS] UTF8String]);
 }
 
 + (void)setupDataModelValueConverter
@@ -171,13 +176,22 @@ static void LTLoadAssociatedPhrases(vChewingLM &lm)
     if (![self checkIfUserDataFolderExists]) {
         return NO;
     }
-    if (![self ensureFileExists:[self userPhrasesDataPathCHT] populateWithTemplate:kUserDataTemplateName extension:kTemplateExtension]) {
+    if (![self ensureFileExists:[self userPhrasesDataPath:imeModeCHS] populateWithTemplate:kUserDataTemplateName extension:kTemplateExtension]) {
         return NO;
     }
-    if (![self ensureFileExists:[self excludedPhrasesDataPathCHT] populateWithTemplate:kExcludedPhrasesvChewingTemplateName extension:kTemplateExtension]) {
+    if (![self ensureFileExists:[self userPhrasesDataPath:imeModeCHT] populateWithTemplate:kUserDataTemplateName extension:kTemplateExtension]) {
         return NO;
     }
-    if (![self ensureFileExists:[self phraseReplacementDataPathCHT] populateWithTemplate:kPhraseReplacementTemplateName extension:kTemplateExtension]) {
+    if (![self ensureFileExists:[self excludedPhrasesDataPath:imeModeCHS] populateWithTemplate:kExcludedPhrasesvChewingTemplateName extension:kTemplateExtension]) {
+        return NO;
+    }
+    if (![self ensureFileExists:[self excludedPhrasesDataPath:imeModeCHT] populateWithTemplate:kExcludedPhrasesvChewingTemplateName extension:kTemplateExtension]) {
+        return NO;
+    }
+    if (![self ensureFileExists:[self phraseReplacementDataPath:imeModeCHS] populateWithTemplate:kPhraseReplacementTemplateName extension:kTemplateExtension]) {
+        return NO;
+    }
+    if (![self ensureFileExists:[self phraseReplacementDataPath:imeModeCHT] populateWithTemplate:kPhraseReplacementTemplateName extension:kTemplateExtension]) {
         return NO;
     }
     return YES;
@@ -196,14 +210,14 @@ static void LTLoadAssociatedPhrases(vChewingLM &lm)
     return NO;
 }
 
-+ (BOOL)writeUserPhrase:(NSString *)userPhrase
++ (BOOL)writeUserPhrase:(NSString *)userPhrase inputMode:(InputMode)mode;
 {
     if (![self checkIfUserLanguageModelFilesExist]) {
         return NO;
     }
 
     BOOL addLineBreakAtFront = NO;
-    NSString *path = [self userPhrasesDataPathCHT];
+    NSString *path = [self userPhrasesDataPath:mode];
 
     if ([[NSFileManager defaultManager] fileExistsAtPath:path]) {
         NSError *error = nil;
@@ -253,34 +267,22 @@ static void LTLoadAssociatedPhrases(vChewingLM &lm)
     return userDictPath;
 }
 
-+ (NSString *)userPhrasesDataPathCHT
++ (NSString *)userPhrasesDataPath:(InputMode)mode;
 {
-    return [[self dataFolderPath] stringByAppendingPathComponent:@"userdata-cht.txt"];
+    NSString *fileName = [mode isEqualToString:imeModeCHT] ? @"userdata-cht.txt" : @"userdata-chs.txt";
+    return [[self dataFolderPath] stringByAppendingPathComponent:fileName];
 }
 
-+ (NSString *)userPhrasesDataPathCHS
++ (NSString *)excludedPhrasesDataPath:(InputMode)mode;
 {
-    return [[self dataFolderPath] stringByAppendingPathComponent:@"userdata-chs.txt"];
+    NSString *fileName = [mode isEqualToString:imeModeCHT] ? @"exclude-phrases-cht.txt" : @"exclude-phrases-chs.txt";
+    return [[self dataFolderPath] stringByAppendingPathComponent:fileName];
 }
 
-+ (NSString *)excludedPhrasesDataPathCHT
++ (NSString *)phraseReplacementDataPath:(InputMode)mode;
 {
-    return [[self dataFolderPath] stringByAppendingPathComponent:@"exclude-phrases-cht.txt"];
-}
-
-+ (NSString *)excludedPhrasesDataPathCHS
-{
-    return [[self dataFolderPath] stringByAppendingPathComponent:@"exclude-phrases-chs.txt"];
-}
-
-+ (NSString *)phraseReplacementDataPathCHT
-{
-    return [[self dataFolderPath] stringByAppendingPathComponent:@"phrases-replacement-cht.txt"];
-}
-
-+ (NSString *)phraseReplacementDataPathCHS
-{
-    return [[self dataFolderPath] stringByAppendingPathComponent:@"phrases-replacement-chs.txt"];
+    NSString *fileName = [mode isEqualToString:imeModeCHT] ? @"phrases-replacement-cht.txt" : @"phrases-replacement-chs.txt";
+    return [[self dataFolderPath] stringByAppendingPathComponent:fileName];
 }
 
  + (vChewingLM *)lmCHT
@@ -293,19 +295,20 @@ static void LTLoadAssociatedPhrases(vChewingLM &lm)
     return &gLangModelCHS;
 }
 
-+ (vChewing::UserOverrideModel *)userOverrideModel
++ (vChewing::UserOverrideModel *)userOverrideModelCHT
 {
-    return &gUserOverrideModel;
+    return &gUserOverrideModelCHT;
 }
 
-+ (BOOL)phraseReplacementEnabled
++ (vChewing::UserOverrideModel *)userOverrideModelCHS
 {
-    return gLangModelCHT.phraseReplacementEnabled();
+    return &gUserOverrideModelCHS;
 }
 
 + (void)setPhraseReplacementEnabled:(BOOL)phraseReplacementEnabled
 {
     gLangModelCHT.setPhraseReplacementEnabled(phraseReplacementEnabled);
+    gLangModelCHS.setPhraseReplacementEnabled(phraseReplacementEnabled);
 }
 
 @end
diff --git a/Source/Modules/LangModelRelated/mgrLangModel_Privates.h b/Source/Modules/LangModelRelated/mgrLangModel_Privates.h
index 103e0fd3..49cd0de8 100644
--- a/Source/Modules/LangModelRelated/mgrLangModel_Privates.h
+++ b/Source/Modules/LangModelRelated/mgrLangModel_Privates.h
@@ -26,7 +26,8 @@ NS_ASSUME_NONNULL_BEGIN
 @interface mgrLangModel ()
 @property (class, readonly, nonatomic) vChewing::vChewingLM *lmCHT;
 @property (class, readonly, nonatomic) vChewing::vChewingLM *lmCHS;
-@property (class, readonly, nonatomic) vChewing::UserOverrideModel *userOverrideModel;
+@property (class, readonly, nonatomic) vChewing::UserOverrideModel *userOverrideModelCHS;
+@property (class, readonly, nonatomic) vChewing::UserOverrideModel *userOverrideModelCHT;
 @end
 
 NS_ASSUME_NONNULL_END