diff --git a/framework/src/Volo.Abp.AspNetCore.Mvc.UI.Bootstrap/TagHelpers/Modal/AbpModalSize.cs b/framework/src/Volo.Abp.AspNetCore.Mvc.UI.Bootstrap/TagHelpers/Modal/AbpModalSize.cs
index ce33f4e073..fae811f79d 100644
--- a/framework/src/Volo.Abp.AspNetCore.Mvc.UI.Bootstrap/TagHelpers/Modal/AbpModalSize.cs
+++ b/framework/src/Volo.Abp.AspNetCore.Mvc.UI.Bootstrap/TagHelpers/Modal/AbpModalSize.cs
@@ -4,6 +4,7 @@
     {
         Default,
         Small,
-        Large
+        Large,
+        ExtraLarge
     }
 }
\ No newline at end of file
diff --git a/framework/src/Volo.Abp.AspNetCore.Mvc.UI.Bootstrap/TagHelpers/Modal/AbpModalSizeExtensions.cs b/framework/src/Volo.Abp.AspNetCore.Mvc.UI.Bootstrap/TagHelpers/Modal/AbpModalSizeExtensions.cs
index ca58dd918e..faf89abc18 100644
--- a/framework/src/Volo.Abp.AspNetCore.Mvc.UI.Bootstrap/TagHelpers/Modal/AbpModalSizeExtensions.cs
+++ b/framework/src/Volo.Abp.AspNetCore.Mvc.UI.Bootstrap/TagHelpers/Modal/AbpModalSizeExtensions.cs
@@ -10,6 +10,8 @@
                     return "modal-sm";
                 case AbpModalSize.Large:
                     return "modal-lg";
+                case AbpModalSize.ExtraLarge:
+                    return "modal-xl";
                 case AbpModalSize.Default:
                     return "";
                 default: