diff --git a/Packages/vChewing_TooltipUI/Sources/TooltipUI/TooltipUI.swift b/Packages/vChewing_TooltipUI/Sources/TooltipUI/TooltipUI.swift
index f64bffc5..885ea976 100644
--- a/Packages/vChewing_TooltipUI/Sources/TooltipUI/TooltipUI.swift
+++ b/Packages/vChewing_TooltipUI/Sources/TooltipUI/TooltipUI.swift
@@ -53,7 +53,7 @@ public class TooltipUI: NSWindowController {
   public func show(
     tooltip: String = "", at point: NSPoint,
     bottomOutOfScreenAdjustmentHeight heightDelta: Double,
-    direction: NSAttributedTooltipTextView.writingDirection = .horizontal
+    direction: NSAttributedTooltipTextView.writingDirection = .horizontal, duration: Double = 0
   ) {
     self.direction = direction
     self.tooltip = tooltip
@@ -61,6 +61,11 @@ public class TooltipUI: NSWindowController {
     window?.orderFront(nil)
     set(windowTopLeftPoint: point, bottomOutOfScreenAdjustmentHeight: heightDelta, useGCD: false)
     window?.setIsVisible(true)
+    if duration > 0 {
+      DispatchQueue.main.asyncAfter(deadline: .now() + duration) {
+        self.window?.orderOut(nil)
+      }
+    }
   }
 
   public func setColor(state: TooltipColorState) {
diff --git a/Source/Modules/SessionCtl_HandleDisplay.swift b/Source/Modules/SessionCtl_HandleDisplay.swift
index f8ad36d7..570afa87 100644
--- a/Source/Modules/SessionCtl_HandleDisplay.swift
+++ b/Source/Modules/SessionCtl_HandleDisplay.swift
@@ -40,7 +40,7 @@ extension SessionCtl {
     return lineHeightRect
   }
 
-  public func showTooltip(_ tooltip: String) {
+  public func showTooltip(_ tooltip: String, duration: Double = 0) {
     guard client() != nil else { return }
     if tooltip.isEmpty {
       tooltipInstance.hide()
@@ -66,8 +66,8 @@ extension SessionCtl {
     }
     // 再設定其文字顯示內容並顯示。
     tooltipInstance.show(
-      tooltip: tooltip, at: finalOrigin,
-      bottomOutOfScreenAdjustmentHeight: delta, direction: tooltipContentDirection
+      tooltip: tooltip, at: finalOrigin, bottomOutOfScreenAdjustmentHeight: delta,
+      direction: tooltipContentDirection, duration: duration
     )
   }
 
diff --git a/Source/Modules/SessionCtl_HandleStates.swift b/Source/Modules/SessionCtl_HandleStates.swift
index 60f461a9..61cc395e 100644
--- a/Source/Modules/SessionCtl_HandleStates.swift
+++ b/Source/Modules/SessionCtl_HandleStates.swift
@@ -76,7 +76,7 @@ extension SessionCtl {
         if previous.hasComposition, ![.ofAbortion, .ofCommitting].contains(newState.type) {
           commit(text: previous.displayedText)
         }
-        showTooltip(newState.tooltip)  // 會在工具提示為空的時候自動消除顯示。
+        showTooltip(newState.tooltip, duration: 1)  // 會在工具提示為空的時候自動消除顯示。
         clearInlineDisplay()
         // 最後一道保險
         inputHandler.clear()
@@ -84,7 +84,7 @@ extension SessionCtl {
         ctlCandidateCurrent.visible = false
         commit(text: newState.textToCommit)
         setInlineDisplayWithCursor()
-        showTooltip(newState.tooltip)  // 會在工具提示為空的時候自動消除顯示。
+        showTooltip(newState.tooltip, duration: 1)  // 會在工具提示為空的時候自動消除顯示。
       case .ofMarking:
         ctlCandidateCurrent.visible = false
         setInlineDisplayWithCursor()