diff --git a/MSDKDns/CacheManager/MSDKDnsNetworkManager.m b/MSDKDns/CacheManager/MSDKDnsNetworkManager.m
index 027697f..92532c7 100644
--- a/MSDKDns/CacheManager/MSDKDnsNetworkManager.m
+++ b/MSDKDns/CacheManager/MSDKDnsNetworkManager.m
@@ -95,11 +95,13 @@ - (instancetype)init
                                                         usingBlock:^(NSNotification *note)
              {
                 BOOL expiredIPEnabled = [[MSDKDnsParamsManager shareInstance] msdkDnsGetExpiredIPEnabled];
-                if (!expiredIPEnabled) {
+                BOOL persistCacheIPEnabled = [[MSDKDnsParamsManager shareInstance] msdkDnsGetPersistCacheIPEnabled];
+                if (!expiredIPEnabled && !persistCacheIPEnabled) {
                     MSDKDNSLOG(@"Application did enter background,clear MSDKDns cache");
-                    //进入后台时清除缓存，暂停网络监测
+                    //进入后台时清除缓存，排除开启了持久化缓存或者开启了使用过期缓存IP的情况
                     [[MSDKDnsManager shareInstance] clearAllCache];
                 }
+                //进入后台时，暂停网络监测
                 [self.reachability stopNotifier];
             }];