diff --git a/backend/app/services/exam_service.py b/backend/app/services/exam_service.py
index 53a783e..f64d0f9 100644
--- a/backend/app/services/exam_service.py
+++ b/backend/app/services/exam_service.py
@@ -328,7 +328,9 @@ class ExamService:
             if exam.questions:
                 try:
                     # 解析questions JSON，统计每种题型的总数
-                    questions_data = json.loads(exam.questions) if isinstance(exam.questions, str) else exam.questions
+                    questions_raw = json.loads(exam.questions) if isinstance(exam.questions, str) else exam.questions
+                    # questions可能是 {"questions": [...]} 或直接是列表
+                    questions_data = questions_raw.get("questions", questions_raw) if isinstance(questions_raw, dict) else questions_raw
                     type_totals = {}
                     type_scores = {}  # 存储每种题型的总分