diff --git a/CHANGELOG.md b/CHANGELOG.md
index 25bcfcc..50056c9 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,7 @@
 * optimize loading [#137](https://github.com/fluttercandies/flutter_smart_dialog/issues/137)
 * optimize 'show debug point'
 * fix [#142](https://github.com/fluttercandies/flutter_smart_dialog/issues/142)
+* add checkExist
 
 
 # [4.9.0]
diff --git a/lib/src/config/smart_config.dart b/lib/src/config/smart_config.dart
index b95619a..e7c4934 100644
--- a/lib/src/config/smart_config.dart
+++ b/lib/src/config/smart_config.dart
@@ -41,6 +41,7 @@ class SmartConfig {
     Set<SmartAllDialogType> dialogTypes = const {
       SmartAllDialogType.custom,
       SmartAllDialogType.attach,
+      SmartAllDialogType.loading,
     },
   }) {
     return DialogKit.instance.checkExist(tag: tag, dialogTypes: dialogTypes);
diff --git a/lib/src/custom/custom_dialog.dart b/lib/src/custom/custom_dialog.dart
index 38f6e9a..7005a2d 100644
--- a/lib/src/custom/custom_dialog.dart
+++ b/lib/src/custom/custom_dialog.dart
@@ -14,8 +14,8 @@ import '../config/enum_config.dart';
 import '../data/animation_param.dart';
 import '../data/base_dialog.dart';
 import '../data/notify_info.dart';
-import '../kit/debounce_utils.dart';
 import '../smart_dialog.dart';
+import '../kit/debounce_utils.dart';
 import '../widget/helper/smart_overlay_entry.dart';
 
 ///main function : custom dialog
diff --git a/lib/src/custom/custom_notify.dart b/lib/src/custom/custom_notify.dart
index 7808d52..8d621e8 100644
--- a/lib/src/custom/custom_notify.dart
+++ b/lib/src/custom/custom_notify.dart
@@ -10,8 +10,8 @@ import '../config/enum_config.dart';
 import '../data/animation_param.dart';
 import '../data/base_dialog.dart';
 import '../data/notify_info.dart';
-import '../kit/debounce_utils.dart';
 import '../smart_dialog.dart';
+import '../kit/debounce_utils.dart';
 import '../widget/helper/smart_overlay_entry.dart';
 
 ///main function : notify dialog
diff --git a/lib/src/helper/dialog_proxy.dart b/lib/src/helper/dialog_proxy.dart
index 427f669..2e6e864 100644
--- a/lib/src/helper/dialog_proxy.dart
+++ b/lib/src/helper/dialog_proxy.dart
@@ -345,7 +345,7 @@ class DialogProxy {
     CloseType closeType = CloseType.normal,
   }) {
     if (status == SmartStatus.smart) {
-      var loading = config.isExistLoading;
+      var loading = config.loading.isExist;
 
       if (loading &&
           (tag == null || (dialogQueue.isEmpty && notifyQueue.isEmpty))) {
diff --git a/lib/src/helper/navigator_observer.dart b/lib/src/helper/navigator_observer.dart
index 2b8a552..29de727 100644
--- a/lib/src/helper/navigator_observer.dart
+++ b/lib/src/helper/navigator_observer.dart
@@ -25,12 +25,16 @@ class SmartNavigatorObserver extends NavigatorObserver {
     RouteRecord.curRoute = previousRoute;
     RouteRecord.instance.pop(route, previousRoute);
 
-    if (!SmartDialog.config.isExist ||
-        route.settings.name == SmartTag.systemDialog) {
+    var checkDialog = SmartDialog.config.checkExist(dialogTypes: {
+      SmartAllDialogType.custom,
+      SmartAllDialogType.attach,
+      SmartAllDialogType.loading,
+    });
+    if (!checkDialog || route.settings.name == SmartTag.systemDialog) {
       return;
     }
 
-    if (SmartDialog.config.isExistLoading) {
+    if (SmartDialog.config.loading.isExist) {
       DialogProxy.instance.dismiss(
         status: SmartStatus.loading,
         closeType: CloseType.route,
diff --git a/lib/src/helper/pop_monitor/boost_route_monitor.dart b/lib/src/helper/pop_monitor/boost_route_monitor.dart
index aadc82b..658e80f 100644
--- a/lib/src/helper/pop_monitor/boost_route_monitor.dart
+++ b/lib/src/helper/pop_monitor/boost_route_monitor.dart
@@ -54,7 +54,7 @@ class BoostRouteMonitor {
     bool shouldHandle = false;
     try {
       //handle loading
-      if (SmartDialog.config.isExistLoading) {
+      if (SmartDialog.config.loading.isExist) {
         return true;
       }
 
diff --git a/lib/src/helper/pop_monitor/monitor_pop_route.dart b/lib/src/helper/pop_monitor/monitor_pop_route.dart
index 23bb2fd..94e6a8f 100644
--- a/lib/src/helper/pop_monitor/monitor_pop_route.dart
+++ b/lib/src/helper/pop_monitor/monitor_pop_route.dart
@@ -22,7 +22,7 @@ class MonitorPopRoute with WidgetsBindingObserver {
   @override
   Future<bool> didPopRoute() async {
     //loading
-    if (SmartDialog.config.isExistLoading) {
+    if (SmartDialog.config.loading.isExist) {
       DialogProxy.instance.dismiss(
         status: SmartStatus.loading,
         closeType: CloseType.back,
diff --git a/lib/src/smart_dialog.dart b/lib/src/smart_dialog.dart
index ddb3627..141c714 100644
--- a/lib/src/smart_dialog.dart
+++ b/lib/src/smart_dialog.dart
@@ -16,6 +16,7 @@ class SmartDialog {
   /// Compatible with older versions
   ///
   /// 兼容老版本
+  @Deprecated("5.0 will be deleted and is not recommended for continued use")
   static CompatibleSmartDialog compatible = CompatibleSmartDialog.instance;
 
   /// SmartDialog global config
diff --git a/pubspec.yaml b/pubspec.yaml
index 5ac2bbd..df13c5a 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -8,7 +8,7 @@ homepage: https://github.com/fluttercandies/flutter_smart_dialog
 # flutter pub publish --server=https://pub.dartlang.org
 
 environment:
-  sdk: '>=2.12.0 <3.0.0'
+  sdk: '>=2.12.0 <4.0.0'
   flutter: ">=3.0.0"
 
 dependencies: