diff --git a/demo/Semi.Avalonia.Demo/Views/MainView.axaml.cs b/demo/Semi.Avalonia.Demo/Views/MainView.axaml.cs
index 876ace2..6407176 100644
--- a/demo/Semi.Avalonia.Demo/Views/MainView.axaml.cs
+++ b/demo/Semi.Avalonia.Demo/Views/MainView.axaml.cs
@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Generic;
+using System.Globalization;
 using System.Threading.Tasks;
 using System.Windows.Input;
 using Avalonia;
@@ -70,37 +71,43 @@ public partial class MainViewModel : ObservableObject
                     {
                         Header = "简体中文",
                         Command = SelectLocaleCommand,
-                        CommandParameter = new System.Globalization.CultureInfo("zh-cn")
+                        CommandParameter = new CultureInfo("zh-cn")
                     },
                     new MenuItemViewModel
                     {
                         Header = "English",
                         Command = SelectLocaleCommand,
-                        CommandParameter = new System.Globalization.CultureInfo("en-us")
+                        CommandParameter = new CultureInfo("en-us")
                     },
                     new MenuItemViewModel
                     {
                         Header = "日本語",
                         Command = SelectLocaleCommand,
-                        CommandParameter = new System.Globalization.CultureInfo("ja-jp")
+                        CommandParameter = new CultureInfo("ja-jp")
                     },
                     new MenuItemViewModel
                     {
                         Header = "Українська",
                         Command = SelectLocaleCommand,
-                        CommandParameter = new System.Globalization.CultureInfo("uk-ua")
+                        CommandParameter = new CultureInfo("uk-ua")
                     },
                     new MenuItemViewModel
                     {
                         Header = "Русский",
                         Command = SelectLocaleCommand,
-                        CommandParameter = new System.Globalization.CultureInfo("ru-ru")
+                        CommandParameter = new CultureInfo("ru-ru")
                     },
                     new MenuItemViewModel
                     {
                         Header = "繁體中文",
                         Command = SelectLocaleCommand,
-                        CommandParameter = new System.Globalization.CultureInfo("zh-tw")
+                        CommandParameter = new CultureInfo("zh-tw")
+                    },
+                    new MenuItemViewModel
+                    {
+                        Header = "Deutsch",
+                        Command = SelectLocaleCommand,
+                        CommandParameter = new CultureInfo("de-de")
                     },
                 ]
             }
diff --git a/src/Semi.Avalonia/Locale/de-de.axaml b/src/Semi.Avalonia/Locale/de-de.axaml
new file mode 100644
index 0000000..8b1fd67
--- /dev/null
+++ b/src/Semi.Avalonia/Locale/de-de.axaml
@@ -0,0 +1,26 @@
+<ResourceDictionary x:Class="Semi.Avalonia.Locale.de_de"
+                    xmlns="https://github.com/avaloniaui"
+                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
+    <!--  DatePicker  -->
+    <x:String x:Key="STRING_DATEPICKER_DAY_TEXT">Tag</x:String>
+    <x:String x:Key="STRING_DATEPICKER_MONTH_TEXT">Monat</x:String>
+    <x:String x:Key="STRING_DATEPICKER_YEAR_TEXT">Jahr</x:String>
+    <!--  TimePicker  -->
+    <x:String x:Key="STRING_TIMEPICKER_HOUR_TEXT">Stunde</x:String>
+    <x:String x:Key="STRING_TIMEPICKER_MINUTE_TEXT">Minute</x:String>
+    <x:String x:Key="STRING_TIMEPICKER_SECOND_TEXT">Sekunde</x:String>
+    <!-- TextBox/SelectableTextBox flyout -->
+    <x:String x:Key="STRING_MENU_CUT">Ausschneiden</x:String>
+    <x:String x:Key="STRING_MENU_COPY">Kopieren</x:String>
+    <x:String x:Key="STRING_MENU_PASTE">Einfügen</x:String>
+    <!--  ManagedFileChooser  -->
+    <x:String x:Key="STRING_CHOOSER_FILE_NAME">Dateiname</x:String>
+    <x:String x:Key="STRING_CHOOSER_SHOW_HIDDEN_FILES">Ausgeblendete Elemente anzeigen</x:String>
+    <x:String x:Key="STRING_CHOOSER_DIALOG_OK">OK</x:String>
+    <x:String x:Key="STRING_CHOOSER_DIALOG_CANCEL">Abbrechen</x:String>
+    <x:String x:Key="STRING_CHOOSER_NAME_COLUMN">Name</x:String>
+    <x:String x:Key="STRING_CHOOSER_DATEMODIFIED_COLUMN">Änderungsdatum</x:String>
+    <x:String x:Key="STRING_CHOOSER_TYPE_COLUMN">Typ</x:String>
+    <x:String x:Key="STRING_CHOOSER_SIZE_COLUMN">Größe</x:String>
+    <x:String x:Key="STRING_CHOOSER_PROMPT_FILE_ALREADY_EXISTS">Die Datei {0} existiert bereits. Möchten Sie sie ersetzen?</x:String>
+</ResourceDictionary>
\ No newline at end of file
diff --git a/src/Semi.Avalonia/Locale/de-de.axaml.cs b/src/Semi.Avalonia/Locale/de-de.axaml.cs
new file mode 100644
index 0000000..76dcfb7
--- /dev/null
+++ b/src/Semi.Avalonia/Locale/de-de.axaml.cs
@@ -0,0 +1,8 @@
+using Avalonia.Controls;
+
+namespace Semi.Avalonia.Locale;
+
+public class de_de : ResourceDictionary
+{
+    
+}
\ No newline at end of file
diff --git a/src/Semi.Avalonia/Locale/en-us.axaml b/src/Semi.Avalonia/Locale/en-us.axaml
index 17ac9fc..8d7d9ba 100644
--- a/src/Semi.Avalonia/Locale/en-us.axaml
+++ b/src/Semi.Avalonia/Locale/en-us.axaml
@@ -16,7 +16,7 @@
     <x:String x:Key="STRING_MENU_PASTE">Paste</x:String>
     <!--  ManagedFileChooser  -->
     <x:String x:Key="STRING_CHOOSER_FILE_NAME">File name</x:String>
-    <x:String x:Key="STRING_CHOOSER_SHOW_HIDDEN_FILES">Show hidden flies</x:String>
+    <x:String x:Key="STRING_CHOOSER_SHOW_HIDDEN_FILES">Show hidden files</x:String>
     <x:String x:Key="STRING_CHOOSER_DIALOG_OK">OK</x:String>
     <x:String x:Key="STRING_CHOOSER_DIALOG_CANCEL">Cancel</x:String>
     <x:String x:Key="STRING_CHOOSER_NAME_COLUMN">Name</x:String>
diff --git a/src/Semi.Avalonia/SemiTheme.axaml.cs b/src/Semi.Avalonia/SemiTheme.axaml.cs
index 9e4f153..48f80a7 100644
--- a/src/Semi.Avalonia/SemiTheme.axaml.cs
+++ b/src/Semi.Avalonia/SemiTheme.axaml.cs
@@ -24,6 +24,7 @@ public class SemiTheme : Styles
         { new CultureInfo("uk-ua"), new uk_ua() },
         { new CultureInfo("ru-ru"), new ru_ru() },
         { new CultureInfo("zh-tw"), new zh_tw() },
+        { new CultureInfo("de-de"), new de_de() },
     };
 
     private readonly IServiceProvider? sp;