diff --git a/Bootstrap.Admin/Views/Shared/GroupConfig.cshtml b/Bootstrap.Admin/Views/Shared/GroupConfig.cshtml
index aa30bf24..9a2ea27b 100644
--- a/Bootstrap.Admin/Views/Shared/GroupConfig.cshtml
+++ b/Bootstrap.Admin/Views/Shared/GroupConfig.cshtml
@@ -1,5 +1,5 @@
 <div class="modal fade" id="dialogGroup" tabindex="-1" role="dialog" data-backdrop="static" aria-labelledby="myGroupModalLabel" aria-hidden="true">
-    <div class="modal-dialog modal-dialog-centered" role="document">
+    <div class="modal-dialog modal-dialog-centered modal-lg" role="document">
         <div class="modal-content">
             <div class="modal-header">
                 <h5 class="modal-title" id="myGroupModalLabel">部门授权窗口</h5>
diff --git a/Bootstrap.Admin/Views/Shared/NavigatorConfig.cshtml b/Bootstrap.Admin/Views/Shared/NavigatorConfig.cshtml
index 879e0f4f..da0572fa 100644
--- a/Bootstrap.Admin/Views/Shared/NavigatorConfig.cshtml
+++ b/Bootstrap.Admin/Views/Shared/NavigatorConfig.cshtml
@@ -1,5 +1,5 @@
 <div class="modal fade" id="dialogMenu" tabindex="-1" role="dialog" data-backdrop="static" aria-labelledby="myMenuModalLabel" aria-hidden="true">
-    <div id="dialogSubMenu" class="modal-dialog modal-dialog-centered" role="document">
+    <div id="dialogSubMenu" class="modal-dialog modal-dialog-centered modal-lg" role="document">
         <div class="modal-content">
             <div class="modal-header">
                 <h5 class="modal-title" id="myMenuModalLabel">请选择菜单</h5>
diff --git a/Bootstrap.Admin/Views/Shared/RoleConfig.cshtml b/Bootstrap.Admin/Views/Shared/RoleConfig.cshtml
index 0b709fbd..1acdceab 100644
--- a/Bootstrap.Admin/Views/Shared/RoleConfig.cshtml
+++ b/Bootstrap.Admin/Views/Shared/RoleConfig.cshtml
@@ -1,5 +1,5 @@
 <div class="modal fade" id="dialogRole" tabindex="-1" role="dialog" data-backdrop="static" aria-labelledby="myRoleModalLabel" aria-hidden="true">
-    <div class="modal-dialog modal-dialog-centered" role="document">
+    <div class="modal-dialog modal-dialog-centered modal-lg" role="document">
         <div class="modal-content">
             <div class="modal-header">
                 <h5 class="modal-title" id="myRoleModalLabel">角色授权窗口</h5>
diff --git a/Bootstrap.Admin/Views/Shared/UserConfig.cshtml b/Bootstrap.Admin/Views/Shared/UserConfig.cshtml
index 09488d46..17266b84 100644
--- a/Bootstrap.Admin/Views/Shared/UserConfig.cshtml
+++ b/Bootstrap.Admin/Views/Shared/UserConfig.cshtml
@@ -1,5 +1,5 @@
 <div class="modal fade" id="dialogUser" tabindex="-1" role="dialog" data-backdrop="static" aria-labelledby="myUserModalLabel" aria-hidden="true">
-    <div class="modal-dialog modal-dialog-centered" role="document">
+    <div class="modal-dialog modal-dialog-centered modal-lg" role="document">
         <div class="modal-content">
             <div class="modal-header">
                 <h5 class="modal-title" id="myUserModalLabel">用户授权窗口</h5>
diff --git a/Bootstrap.Admin/Views/Shared/_Default.cshtml b/Bootstrap.Admin/Views/Shared/_Default.cshtml
index 48db4c4a..cf9f9fae 100644
--- a/Bootstrap.Admin/Views/Shared/_Default.cshtml
+++ b/Bootstrap.Admin/Views/Shared/_Default.cshtml
@@ -29,7 +29,7 @@
 }
 @section modal {
     <div class="modal fade" id="dialogNew" tabindex="-1" role="dialog" data-backdrop="static" aria-labelledby="myModalLabel" aria-hidden="true">
-        <div class="modal-dialog modal-dialog-centered" role="document">
+        <div class="modal-dialog modal-dialog-centered modal-lg" role="document">
             <div class="modal-content" data-toggle="LgbValidate" data-valid-button="#btnSubmit" data-valid-modal="#dialogNew">
                 @RenderSection("modal", false)
                 <div class="modal-footer">
diff --git a/Bootstrap.Admin/wwwroot/css/site-responsive.css b/Bootstrap.Admin/wwwroot/css/site-responsive.css
index 8449a369..e299b586 100644
--- a/Bootstrap.Admin/wwwroot/css/site-responsive.css
+++ b/Bootstrap.Admin/wwwroot/css/site-responsive.css
@@ -10,7 +10,7 @@
         padding-bottom: 5px;
     }
 
-    .modal-dialog {
+    .modal-lg {
         max-width: calc(90%);
     }
 }
@@ -46,6 +46,12 @@
     }
 }
 
+@media (min-width: 992px) {
+    .modal-lg {
+        max-width: 900px;
+    }
+}
+
 @media (min-height: 672px) {
     html, body {
         height: 100%;