diff --git a/example/app/src/main/java/com/ruilaizi/example/ui/MainViewModel.java b/example/app/src/main/java/com/ruilaizi/example/ui/MainViewModel.java
index 3df733e..896be0f 100644
--- a/example/app/src/main/java/com/ruilaizi/example/ui/MainViewModel.java
+++ b/example/app/src/main/java/com/ruilaizi/example/ui/MainViewModel.java
@@ -89,9 +89,10 @@ public class MainViewModel extends AndroidViewModel {
         resultLiveData.setValue("");
         errorLiveData.setValue(null);
 
+        final String inputForOptimize = prompt;
         executor.execute(() -> {
             try {
-                PromptGenerator.OptimizeResult result = repository.optimizePrompt(prompt, 0.7f, 1000);
+                PromptGenerator.OptimizeResult result = repository.optimizePrompt(inputForOptimize, 0.7f, 1000);
                 String display = result.toDisplayText();
                 resultLiveData.postValue(display);
                 snackbarLiveData.postValue("提示词优化完成");