diff --git a/modules/docs/src/Volo.Docs.Application.Contracts/Volo/Docs/Documents/GetDefaultDocumentInput.cs b/modules/docs/src/Volo.Docs.Application.Contracts/Volo/Docs/Documents/GetDefaultDocumentInput.cs
index 4cfab98225..c606c3be5d 100644
--- a/modules/docs/src/Volo.Docs.Application.Contracts/Volo/Docs/Documents/GetDefaultDocumentInput.cs
+++ b/modules/docs/src/Volo.Docs.Application.Contracts/Volo/Docs/Documents/GetDefaultDocumentInput.cs
@@ -1,5 +1,6 @@
 using System;
 using System.ComponentModel.DataAnnotations;
+using Volo.Docs.Language;
 using Volo.Docs.Projects;
 
 namespace Volo.Docs.Documents
@@ -11,7 +12,7 @@ namespace Volo.Docs.Documents
         [StringLength(ProjectConsts.MaxVersionNameLength)]
         public string Version { get; set; }
 
-        [StringLength(ProjectConsts.MaxLanguageCodeLength)]
+        [StringLength(LanguageConsts.MaxLanguageCodeLength)]
         public string LanguageCode { get; set; }
     }
 }
\ No newline at end of file
diff --git a/modules/docs/src/Volo.Docs.Application.Contracts/Volo/Docs/Documents/GetDocumentInput.cs b/modules/docs/src/Volo.Docs.Application.Contracts/Volo/Docs/Documents/GetDocumentInput.cs
index 825c1a7942..e28237c352 100644
--- a/modules/docs/src/Volo.Docs.Application.Contracts/Volo/Docs/Documents/GetDocumentInput.cs
+++ b/modules/docs/src/Volo.Docs.Application.Contracts/Volo/Docs/Documents/GetDocumentInput.cs
@@ -1,5 +1,6 @@
 using System;
 using System.ComponentModel.DataAnnotations;
+using Volo.Docs.Language;
 using Volo.Docs.Projects;
 
 namespace Volo.Docs.Documents
@@ -15,7 +16,7 @@ namespace Volo.Docs.Documents
         [StringLength(ProjectConsts.MaxVersionNameLength)]
         public string Version { get; set; }
 
-        [StringLength(ProjectConsts.MaxLanguageCodeLength)]
+        [StringLength(LanguageConsts.MaxLanguageCodeLength)]
         public string LanguageCode { get; set; }
     }
 }
\ No newline at end of file
diff --git a/modules/docs/src/Volo.Docs.Application.Contracts/Volo/Docs/Documents/GetDocumentResourceInput.cs b/modules/docs/src/Volo.Docs.Application.Contracts/Volo/Docs/Documents/GetDocumentResourceInput.cs
index eb0d853e06..1fff5a1e12 100644
--- a/modules/docs/src/Volo.Docs.Application.Contracts/Volo/Docs/Documents/GetDocumentResourceInput.cs
+++ b/modules/docs/src/Volo.Docs.Application.Contracts/Volo/Docs/Documents/GetDocumentResourceInput.cs
@@ -1,5 +1,6 @@
 using System;
 using System.ComponentModel.DataAnnotations;
+using Volo.Docs.Language;
 using Volo.Docs.Projects;
 
 namespace Volo.Docs.Documents
@@ -15,7 +16,7 @@ namespace Volo.Docs.Documents
         [StringLength(ProjectConsts.MaxVersionNameLength)]
         public string Version { get; set; }
 
-        [StringLength(ProjectConsts.MaxLanguageCodeLength)]
+        [StringLength(LanguageConsts.MaxLanguageCodeLength)]
         public string LanguageCode { get; set; }
     }
 }
\ No newline at end of file
diff --git a/modules/docs/src/Volo.Docs.Application.Contracts/Volo/Docs/Documents/GetNavigationDocumentInput.cs b/modules/docs/src/Volo.Docs.Application.Contracts/Volo/Docs/Documents/GetNavigationDocumentInput.cs
index 473014eb25..c2a614ce58 100644
--- a/modules/docs/src/Volo.Docs.Application.Contracts/Volo/Docs/Documents/GetNavigationDocumentInput.cs
+++ b/modules/docs/src/Volo.Docs.Application.Contracts/Volo/Docs/Documents/GetNavigationDocumentInput.cs
@@ -1,5 +1,6 @@
 using System;
 using System.ComponentModel.DataAnnotations;
+using Volo.Docs.Language;
 using Volo.Docs.Projects;
 
 namespace Volo.Docs.Documents
@@ -11,7 +12,7 @@ namespace Volo.Docs.Documents
         [StringLength(ProjectConsts.MaxVersionNameLength)]
         public string Version { get; set; }
 
-        [StringLength(ProjectConsts.MaxLanguageCodeLength)]
+        [StringLength(LanguageConsts.MaxLanguageCodeLength)]
         public string LanguageCode { get; set; }
     }
 }
\ No newline at end of file
diff --git a/modules/docs/src/Volo.Docs.Domain.Shared/Volo/Docs/Language/LanguageConsts.cs b/modules/docs/src/Volo.Docs.Domain.Shared/Volo/Docs/Language/LanguageConsts.cs
new file mode 100644
index 0000000000..867cc2dd4e
--- /dev/null
+++ b/modules/docs/src/Volo.Docs.Domain.Shared/Volo/Docs/Language/LanguageConsts.cs
@@ -0,0 +1,8 @@
+
+namespace Volo.Docs.Language
+{
+    public static class LanguageConsts
+    {
+        public const int MaxLanguageCodeLength = 10;
+    }
+}
diff --git a/modules/docs/src/Volo.Docs.Domain.Shared/Volo/Docs/Projects/ProjectConsts.cs b/modules/docs/src/Volo.Docs.Domain.Shared/Volo/Docs/Projects/ProjectConsts.cs
index ea5506151f..57f3c17112 100644
--- a/modules/docs/src/Volo.Docs.Domain.Shared/Volo/Docs/Projects/ProjectConsts.cs
+++ b/modules/docs/src/Volo.Docs.Domain.Shared/Volo/Docs/Projects/ProjectConsts.cs
@@ -8,6 +8,5 @@
         public const int MaxNavigationDocumentNameLength = 128;
         public const int MaxLatestVersionBranchNameLength = 128;
         public const int MaxVersionNameLength = 128;
-        public const int MaxLanguageCodeLength = 10;
     }
 }