diff --git a/.env.example b/.env.example
index 3d25033..80561fa 100644
--- a/.env.example
+++ b/.env.example
@@ -19,3 +19,5 @@ SIM_HEAP_LIMIT_MB=128
 SIM_CPU_LIMIT_SECONDS=120
 # 每次运行最长时间（分钟）
 SIM_MAX_RUN_MINUTES=60
+# 全站同时跑几个评分检查项（提交评分和"自己检查"共用）；2 核服务器不要超过 24，CPU 不够会误判
+SIM_GRADE_CONCURRENCY=16
diff --git a/compose.yaml b/compose.yaml
index b47703d..7db62f8 100644
--- a/compose.yaml
+++ b/compose.yaml
@@ -33,6 +33,7 @@ services:
       SIM_HEAP_LIMIT_MB: ${SIM_HEAP_LIMIT_MB:-128}
       SIM_CPU_LIMIT_SECONDS: ${SIM_CPU_LIMIT_SECONDS:-120}
       SIM_MAX_RUN_MINUTES: ${SIM_MAX_RUN_MINUTES:-60}
+      SIM_GRADE_CONCURRENCY: ${SIM_GRADE_CONCURRENCY:-16}
     # 容器文件系统只读，只有 /tmp（学生工程的临时目录）和数据卷可写
     read_only: true
     tmpfs: