diff --git a/srcs/service/dhcpd/lease.c b/srcs/service/dhcpd/lease.c
index 84c95e0..1aef42a 100644
--- a/srcs/service/dhcpd/lease.c
+++ b/srcs/service/dhcpd/lease.c
@@ -15,6 +15,8 @@
 //static PMAC_FILTER   g_blackListTbl = NULL;
 //static PPRE_ALLOC_IP g_pPreAllocIp = NULL;
 
+static uv_mutex_t g_uvLock;
+
 U32 lease_is_pre_assign(PDHCP_REQ pReq) {
     char macStr[20] = {0};
     U32  ipAddr;
@@ -84,7 +86,6 @@ int pre_alloc_dhcp_res(PDHCP_REQ pReq, PDHCP_USER pUser, U32 *pOutIp, PPOOL_CTX
 
     LL_FOREACH_SAFE(pUser->pUserPool, pPool, pTemp) {
         U32 addr;
-
         // 查看是否预分配过该设备
         if ((addr = lease_is_pre_assign(pReq)) != 0) {
             *pOutIp   = addr;
@@ -92,6 +93,7 @@ int pre_alloc_dhcp_res(PDHCP_REQ pReq, PDHCP_USER pUser, U32 *pOutIp, PPOOL_CTX
             return ERR_SUCCESS;
         }
 
+        uv_mutex_lock(&g_uvLock);
         addr = pPool->minAddr;
         do {
             PLOCK_IP pLock;
@@ -103,12 +105,13 @@ int pre_alloc_dhcp_res(PDHCP_REQ pReq, PDHCP_USER pUser, U32 *pOutIp, PPOOL_CTX
                     *pOutIp   = addr;
                     *pOutPool = pPool;
                     db_add_pre_assign(pReq, addr, pPool);
+                    uv_mutex_unlock(&g_uvLock);
                     return ERR_SUCCESS;
                 }
             }
-
             addr++;
         } while (addr <= pPool->maxAddr);
+        uv_mutex_unlock(&g_uvLock);
     }
 
     // 清理所有超时的预分配IP
@@ -121,6 +124,8 @@ int pre_alloc_dhcp_res(PDHCP_REQ pReq, PDHCP_USER pUser, U32 *pOutIp, PPOOL_CTX
 int dhcp_lease_init() {
     int rc;
 
+    uv_mutex_init(&g_uvLock);
+
     rc = db_init_lease_database();
 
     if (rc != ERR_SUCCESS) {