diff --git a/aiChat/mixins/chatMixinsV2.js b/aiChat/mixins/chatMixinsV2.js
index c7c6ded..41023d3 100644
--- a/aiChat/mixins/chatMixinsV2.js
+++ b/aiChat/mixins/chatMixinsV2.js
@@ -217,6 +217,14 @@ export const chatMixinsV2 = {
         handleLoginFailure()
         return
       }
+      if (params.prompt.length > 500) {
+        uni.showToast({
+          title: "字数已超出限制",
+          icon: "none",
+          duration: 5000
+        })
+        return
+      }
       if (this.loading) return
       const prompt = params.prompt.substr(0, 500)
       if (params.init !== 1) {