diff --git a/framework/src/Volo.Abp.Cli.Core/Volo/Abp/Cli/Commands/ProjectCreationCommandBase.cs b/framework/src/Volo.Abp.Cli.Core/Volo/Abp/Cli/Commands/ProjectCreationCommandBase.cs
index fa0cc26d11..b3064146fc 100644
--- a/framework/src/Volo.Abp.Cli.Core/Volo/Abp/Cli/Commands/ProjectCreationCommandBase.cs
+++ b/framework/src/Volo.Abp.Cli.Core/Volo/Abp/Cli/Commands/ProjectCreationCommandBase.cs
@@ -560,10 +560,11 @@ public abstract class ProjectCreationCommandBase
         }
 
         var themeStyle = commandLineArgs.Options.GetOrNull(Options.ThemeStyle.Long)?.ToLower();
+        
         return themeStyle switch 
         {
-            // null => ThemeStyle.NotSpecified, TODO: remove it!!!
-            "dim" or null => ThemeStyle.Dim,
+            "system" or null => ThemeStyle.System,
+            "dim" => ThemeStyle.Dim,
             "light" => ThemeStyle.Light,
             "dark" => ThemeStyle.Dark,
             _ => null
diff --git a/framework/src/Volo.Abp.Cli.Core/Volo/Abp/Cli/ProjectBuilding/Building/Steps/ChangeThemeStyleStep.cs b/framework/src/Volo.Abp.Cli.Core/Volo/Abp/Cli/ProjectBuilding/Building/Steps/ChangeThemeStyleStep.cs
index ef6a1e9474..5f4a0e5917 100644
--- a/framework/src/Volo.Abp.Cli.Core/Volo/Abp/Cli/ProjectBuilding/Building/Steps/ChangeThemeStyleStep.cs
+++ b/framework/src/Volo.Abp.Cli.Core/Volo/Abp/Cli/ProjectBuilding/Building/Steps/ChangeThemeStyleStep.cs
@@ -14,6 +14,9 @@ public class ChangeThemeStyleStep : ProjectBuildPipelineStep
 
         switch (context.BuildArgs.ThemeStyle)
         {
+            case ThemeStyle.Dim:
+                ChangeThemeStyle(context, themeStyleName: "Dim");
+                break;
             case ThemeStyle.Light:
                 ChangeThemeStyle(context, themeStyleName: "Light");
                 break;
@@ -25,7 +28,7 @@ public class ChangeThemeStyleStep : ProjectBuildPipelineStep
 
     private void ChangeThemeStyle(ProjectBuildContext context, string themeStyleName)
     {
-        var defaultThemeStyleName = "LeptonXStyleNames.Dim";
+        var defaultThemeStyleName = "LeptonXStyleNames.System";
         var newThemeStyleName = $"LeptonXStyleNames.{themeStyleName}";
 
         var filePaths = new List<string> 
diff --git a/framework/src/Volo.Abp.Cli.Core/Volo/Abp/Cli/ProjectBuilding/Building/ThemeStyle.cs b/framework/src/Volo.Abp.Cli.Core/Volo/Abp/Cli/ProjectBuilding/Building/ThemeStyle.cs
index e9a8804f70..eae3a303ff 100644
--- a/framework/src/Volo.Abp.Cli.Core/Volo/Abp/Cli/ProjectBuilding/Building/ThemeStyle.cs
+++ b/framework/src/Volo.Abp.Cli.Core/Volo/Abp/Cli/ProjectBuilding/Building/ThemeStyle.cs
@@ -1,7 +1,7 @@
 namespace Volo.Abp.Cli.ProjectBuilding.Building;
 public enum ThemeStyle : byte
 {
-    NotSpecified = 0,
+    System = 0,
     Dim = 1,
     Light = 2,
     Dark = 3