diff --git a/DM_Weight/ViewModels/RoleManagerWindowViewModel.cs b/DM_Weight/ViewModels/RoleManagerWindowViewModel.cs
index fff27e7..0ec972d 100644
--- a/DM_Weight/ViewModels/RoleManagerWindowViewModel.cs
+++ b/DM_Weight/ViewModels/RoleManagerWindowViewModel.cs
@@ -16,6 +16,8 @@ using DM_Weight.Models;
 using DM_Weight.util;
 using System.Data;
 using System.Configuration;
+using MaterialDesignThemes.Wpf;
+using System.Windows.Media;
 
 namespace DM_Weight.ViewModels
 {
@@ -83,7 +85,7 @@ namespace DM_Weight.ViewModels
                             {
                                 int i = p.Children.ToList().FindIndex(it4 => it4.Id == it3.Id);
                                 //if (i > 0 && AllPremissions.ElementAt(index).Children.Count > i)
-                                if (p.Children[i]!=null)
+                                if (p.Children.Count > 0 && i >= 0 && p.Children[i] != null)
                                 {
                                     AllPremissions.ElementAt(index).Children.RemoveAt(i);
                                 }
@@ -598,6 +600,20 @@ namespace DM_Weight.ViewModels
             });
         }
 
+        private ISnackbarMessageQueue _snackbarMessageQueue = new SnackbarMessageQueue(TimeSpan.FromSeconds(3));
+        public ISnackbarMessageQueue SnackbarMessageQueue
+        {
+            get => _snackbarMessageQueue;
+            set => SetProperty(ref _snackbarMessageQueue, value);
+        }
+        private SolidColorBrush _colorBrush;
+
+        public SolidColorBrush SnackbarBackground
+        {
+            get => _colorBrush;
+            set => SetProperty(ref _colorBrush, value);
+        }
+
         public DelegateCommand AddRole
         {
             get => new DelegateCommand(() =>
@@ -605,6 +621,13 @@ namespace DM_Weight.ViewModels
                 Role.Id = 0;
                 Role.MachineId = ConfigurationManager.AppSettings["machineId"] ?? "DM1";
                 Role.Permissions = RightPremissions.ToList();
+                List<RoleDm> roleList = SqlSugarHelper.Db.Queryable<RoleDm>().Where(r => r.RoleName == Role.RoleName).ToList();
+                if (roleList.Count > 0)
+                {
+                    SnackbarBackground = new SolidColorBrush((Color)ColorConverter.ConvertFromString("#b71c1c"));
+                    SnackbarMessageQueue.Enqueue("该角色已存在！");
+                    return;
+                }
                 SqlSugarHelper.Db.Insertable<RoleDm>(Role).ExecuteCommand();
                 RequestData();
             });
diff --git a/DM_Weight/Views/RoleManagerWindow.xaml b/DM_Weight/Views/RoleManagerWindow.xaml
index dc606c7..766fa2e 100644
--- a/DM_Weight/Views/RoleManagerWindow.xaml
+++ b/DM_Weight/Views/RoleManagerWindow.xaml
@@ -189,5 +189,8 @@
                 
             </Grid>
         </GroupBox>
+        <materialDesign:Snackbar
+                Background="{Binding SnackbarBackground}"
+                MessageQueue="{Binding SnackbarMessageQueue}"/>
     </Grid>
 </UserControl>