diff --git a/src/components/Course/courseTag.vue b/src/components/Course/courseTag.vue
index 4b64113c..b87ac90a 100644
--- a/src/components/Course/courseTag.vue
+++ b/src/components/Course/courseTag.vue
@@ -230,6 +230,12 @@ export default {
         this.$message.error('标签不能超过8个字')
         return;
       }
+      // 检查标签是否在下拉框中已存在
+      const isExistInSearch = this.searchResults.some(tag => tag.tagName === tagName);
+      if (isExistInSearch) {
+        this.$message.warning('已存在此标签，请选择');
+        return;
+      }
       // 首先检查是否与已选择的标签重复
       const isDuplicate = this.selectedTags.some(tag => tag.tagName === tagName);
       if (isDuplicate) {