diff --git a/.gitea/workflows/autograde.yml b/.gitea/workflows/autograde.yml
index 9cadbc5..fb4b63c 100644
--- a/.gitea/workflows/autograde.yml
+++ b/.gitea/workflows/autograde.yml
@@ -238,14 +238,19 @@ jobs:
             SHORT_SHA=$(echo "$COMMIT_SHA" | cut -c1-7)
             DEST_PATH="reports/grade_report_${SHORT_SHA}.${REPORT_FILE##*.}"
             
-            # Base64 编码
+            # Base64 编码并保存到临时文件（避免命令行参数过长）
             CONTENT=$(base64 -w 0 "$REPORT_FILE")
             
+            # 创建请求 JSON 文件
+            cat > /tmp/upload_request.json << EOF
+          {"message": "Add grade report for $SHORT_SHA", "content": "$CONTENT"}
+          EOF
+            
             # 先尝试 POST 创建新文件
             RESULT=$(curl -s -X POST -H "Authorization: token $TOKEN" \
               -H "Content-Type: application/json" \
               "$API_URL/repos/$REPO/contents/$DEST_PATH" \
-              -d "{\"message\": \"Add grade report for $SHORT_SHA\", \"content\": \"$CONTENT\"}")
+              -d @/tmp/upload_request.json)
             
             if echo "$RESULT" | grep -q '"content"'; then
               echo "✅ Report uploaded to $DEST_PATH"
@@ -257,10 +262,15 @@ jobs:
                 | python3 -c "import sys,json; d=json.load(sys.stdin); print(d.get('sha','') if isinstance(d,dict) and 'sha' in d else '')" 2>/dev/null || echo "")
               
               if [ -n "$SHA" ]; then
+                # 创建更新请求 JSON 文件
+                cat > /tmp/upload_request.json << EOF
+          {"message": "Update grade report for $SHORT_SHA", "content": "$CONTENT", "sha": "$SHA"}
+          EOF
+                
                 RESULT=$(curl -s -X PUT -H "Authorization: token $TOKEN" \
                   -H "Content-Type: application/json" \
                   "$API_URL/repos/$REPO/contents/$DEST_PATH" \
-                  -d "{\"message\": \"Update grade report for $SHORT_SHA\", \"content\": \"$CONTENT\", \"sha\": \"$SHA\"}")
+                  -d @/tmp/upload_request.json)
                 
                 if echo "$RESULT" | grep -q '"content"'; then
                   echo "✅ Report updated at $DEST_PATH"
@@ -271,6 +281,9 @@ jobs:
                 echo "⚠️ Could not get file SHA, upload failed"
               fi
             fi
+            
+            # 清理临时文件
+            rm -f /tmp/upload_request.json
           fi
       
       - name: Create metadata