diff --git a/backend/app/services/ai/answer_judge_service.py b/backend/app/services/ai/answer_judge_service.py
index 9d57e0a..a608374 100644
--- a/backend/app/services/ai/answer_judge_service.py
+++ b/backend/app/services/ai/answer_judge_service.py
@@ -102,7 +102,7 @@ class AnswerJudgeService:
             
             ai_response = await ai_service.chat(
                 messages=messages,
-                model="gemini-2.5-flash-preview",  # 使用快速模型，提升响应速度
+                model="gemini-3-flash-preview",  # 使用快速模型，提升响应速度
                 temperature=0.1,  # 低温度，确保输出稳定
                 prompt_name="answer_judge"
             )