diff --git a/src/Volo.Abp.IdentityServer.Domain.Shared/Volo/Abp/IdentityServer/Clients/ClientGrantTypeConsts.cs b/src/Volo.Abp.IdentityServer.Domain.Shared/Volo/Abp/IdentityServer/Clients/ClientGrantTypeConsts.cs
index 5f94c51f97..f13f6cda1e 100644
--- a/src/Volo.Abp.IdentityServer.Domain.Shared/Volo/Abp/IdentityServer/Clients/ClientGrantTypeConsts.cs
+++ b/src/Volo.Abp.IdentityServer.Domain.Shared/Volo/Abp/IdentityServer/Clients/ClientGrantTypeConsts.cs
@@ -2,6 +2,6 @@
 {
     public class ClientGrantTypeConsts
     {
-        public const int GrantTypeMaxLength = 250;
+        public const int GrantTypeMaxLength = 196;
     }
 }
\ No newline at end of file
diff --git a/src/Volo.Abp.IdentityServer.Domain/Volo/Abp/IdentityServer/Clients/ClientGrantType.cs b/src/Volo.Abp.IdentityServer.Domain/Volo/Abp/IdentityServer/Clients/ClientGrantType.cs
index aaf289fe67..98ad17d6aa 100644
--- a/src/Volo.Abp.IdentityServer.Domain/Volo/Abp/IdentityServer/Clients/ClientGrantType.cs
+++ b/src/Volo.Abp.IdentityServer.Domain/Volo/Abp/IdentityServer/Clients/ClientGrantType.cs
@@ -1,20 +1,20 @@
 using System;
-using Volo.Abp.Domain.Values;
+using Volo.Abp.Domain.Entities;
 
 namespace Volo.Abp.IdentityServer.Clients
 {
-    public class ClientGrantType : ValueObject<ClientGrantType>
+    public class ClientGrantType : Entity
     {
-        public virtual string GrantType { get; protected set; }
-
         public virtual Guid ClientId { get; protected set; }
 
+        public virtual string GrantType { get; protected set; }
+
         protected ClientGrantType()
         {
 
         }
 
-        public ClientGrantType(Guid clientId, string grantType)
+        protected internal ClientGrantType(Guid clientId, string grantType)
         {
             ClientId = clientId;
             GrantType = grantType;
diff --git a/src/Volo.Abp.IdentityServer.EntityFrameworkCore/Volo/Abp/IdentityServer/EntityFrameworkCore/IdentityServerDbContext.cs b/src/Volo.Abp.IdentityServer.EntityFrameworkCore/Volo/Abp/IdentityServer/EntityFrameworkCore/IdentityServerDbContext.cs
index 5d91ee65b7..615607f3be 100644
--- a/src/Volo.Abp.IdentityServer.EntityFrameworkCore/Volo/Abp/IdentityServer/EntityFrameworkCore/IdentityServerDbContext.cs
+++ b/src/Volo.Abp.IdentityServer.EntityFrameworkCore/Volo/Abp/IdentityServer/EntityFrameworkCore/IdentityServerDbContext.cs
@@ -72,14 +72,14 @@ namespace Volo.Abp.IdentityServer.EntityFrameworkCore
                 client.Property(x => x.ClientClaimsPrefix).HasMaxLength(ClientConsts.ClientClaimsPrefixMaxLength);
                 client.Property(x => x.PairWiseSubjectSalt).HasMaxLength(ClientConsts.PairWiseSubjectSaltMaxLength);
 
+                client.HasMany(x => x.AllowedScopes).WithOne().HasForeignKey(x => x.ClientId).IsRequired();
+                client.HasMany(x => x.ClientSecrets).WithOne().HasForeignKey(x => x.ClientId).IsRequired();
                 client.HasMany(x => x.AllowedGrantTypes).WithOne().HasForeignKey(x => x.ClientId).IsRequired();
+                client.HasMany(x => x.AllowedCorsOrigins).WithOne().HasForeignKey(x => x.ClientId).IsRequired();
                 client.HasMany(x => x.RedirectUris).WithOne().HasForeignKey(x => x.ClientId).IsRequired();
                 client.HasMany(x => x.PostLogoutRedirectUris).WithOne().HasForeignKey(x => x.ClientId).IsRequired();
-                client.HasMany(x => x.AllowedScopes).WithOne().HasForeignKey(x => x.ClientId).IsRequired();
-                client.HasMany(x => x.ClientSecrets).WithOne().HasForeignKey(x => x.ClientId).IsRequired();
-                client.HasMany(x => x.Claims).WithOne().HasForeignKey(x => x.ClientId).IsRequired();
                 client.HasMany(x => x.IdentityProviderRestrictions).WithOne().HasForeignKey(x => x.ClientId).IsRequired();
-                client.HasMany(x => x.AllowedCorsOrigins).WithOne().HasForeignKey(x => x.ClientId).IsRequired();
+                client.HasMany(x => x.Claims).WithOne().HasForeignKey(x => x.ClientId).IsRequired();
                 client.HasMany(x => x.Properties).WithOne().HasForeignKey(x => x.ClientId).IsRequired();
 
                 client.HasIndex(x => x.ClientId).IsUnique();
@@ -91,7 +91,6 @@ namespace Volo.Abp.IdentityServer.EntityFrameworkCore
 
                 grantType.HasKey(x => new {x.ClientId, x.GrantType});
 
-                grantType.Property(x => x.ClientId).IsRequired();
                 grantType.Property(x => x.GrantType).HasMaxLength(ClientGrantTypeConsts.GrantTypeMaxLength).IsRequired();
             });