diff --git a/backend-java/src/main/java/com/competition/modules/biz/contest/service/impl/ContestServiceImpl.java b/backend-java/src/main/java/com/competition/modules/biz/contest/service/impl/ContestServiceImpl.java
index 810f2ec..c9c7bc3 100644
--- a/backend-java/src/main/java/com/competition/modules/biz/contest/service/impl/ContestServiceImpl.java
+++ b/backend-java/src/main/java/com/competition/modules/biz/contest/service/impl/ContestServiceImpl.java
@@ -6,6 +6,7 @@ import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
 import com.competition.common.enums.ErrorCode;
 import com.competition.common.exception.BusinessException;
 import com.competition.common.result.PageResult;
+import com.competition.common.util.SecurityUtil;
 import com.competition.modules.biz.contest.dto.CreateContestDto;
 import com.competition.modules.biz.contest.dto.QueryContestDto;
 import com.competition.modules.biz.contest.entity.BizContest;
@@ -79,6 +80,14 @@ public class ContestServiceImpl extends ServiceImpl<ContestMapper, BizContest> i
             }
             entity.setCreator(creatorId != null ? creatorId.intValue() : null);
 
+            // 如果没有设置授权租户，默认添加当前租户
+            if (entity.getContestTenants() == null || entity.getContestTenants().isEmpty()) {
+                Long currentTenantId = SecurityUtil.getCurrentTenantId();
+                if (currentTenantId != null) {
+                    entity.setContestTenants(Collections.singletonList(currentTenantId.intValue()));
+                }
+            }
+
             save(entity);
             log.info("赛事创建成功，ID：{}, 名称：{}", entity.getId(), entity.getContestName());
             return entity;