diff --git a/play-admin/src/main/java/com/starry/admin/modules/platform/service/impl/SysTenantServiceImpl.java b/play-admin/src/main/java/com/starry/admin/modules/platform/service/impl/SysTenantServiceImpl.java
index 3bfd9a1..288c36e 100644
--- a/play-admin/src/main/java/com/starry/admin/modules/platform/service/impl/SysTenantServiceImpl.java
+++ b/play-admin/src/main/java/com/starry/admin/modules/platform/service/impl/SysTenantServiceImpl.java
@@ -202,7 +202,7 @@ public class SysTenantServiceImpl extends ServiceImpl<SysTenantMapper, SysTenant
             sysTenantEntity.setTenantCode(IdUtils.getUuid());
         }
         // 生成随机key，用来生成域名，关键！
-        sysTenantEntity.setTenantKey(RandomUtil.randomString(8));
+        sysTenantEntity.setTenantKey(RandomUtil.randomString(8).toLowerCase());
         // 创建租户
         sysTenantEntity.setCreatedTime(new Date());
         sysTenantMapper.insert(sysTenantEntity);