diff --git a/Falcon.SugarApi/DatabaseDefinitions/SugarConnectionConfig.cs b/Falcon.SugarApi/DatabaseDefinitions/SugarConnectionConfig.cs
index 8545594..c5d4749 100644
--- a/Falcon.SugarApi/DatabaseDefinitions/SugarConnectionConfig.cs
+++ b/Falcon.SugarApi/DatabaseDefinitions/SugarConnectionConfig.cs
@@ -18,50 +18,64 @@ namespace Falcon.SugarApi.DatabaseDefinitions
         /// </summary>
         public bool Log { get; set; }
 
+        /// <summary>
+        /// 实体创建服务
+        /// </summary>
+        public Action<PropertyInfo, EntityColumnInfo> EntityService
+            => this.ConfigureExternalServices.EntityService;
+
         /// <summary>
         /// 实例化SugarDb链接配置
         /// </summary>
         public SugarConnectionConfig() {
             this.ConfigureExternalServices ??= new ConfigureExternalServices { };
-            //设置Nullable
-            this.ConfigureExternalServices.EntityService += (p, c) => {
-                var pt = p.PropertyType;
-                //所有类型默认可空
-                bool na = true;
-                //字符串默认可空
-                na = pt == typeof(string) ? true : na;
-                //Nullable<>类型可空
-                if (pt.IsGenericType && pt.GetGenericTypeDefinition() == typeof(Nullable<>)) {
-                    na = true;
-                }
-                //RequiredAttribute标记不可空
-                if (p.GetCustomAttribute<RequiredAttribute>() != null) {
-                    na = false;
-                }
-                //主键不可以为空
-                if (p.TryGetAttribute<KeyAttribute>(out var _)) {
-                    na = false;
-                }
-                //定义主键不可以为空
-                if (p.TryGetAttribute<SugarColumn>(out var sc) && sc.IsPrimaryKey) {
-                    na = false;
-                }
-                c.IsNullable = na;
-                //var sc = pt.GetCustomAttribute<SugarColumn>();
-                //if (sc != null) {
-                //    c.IsNullable = sc.IsNullable;
-                //}
-                //var isNullableTypes = new Type[] { typeof(string) };
-                //if (isNullableTypes.Contains(pt)) {
-                //    c.IsNullable = true;
-                //}
-                //else {
-                //    c.IsNullable = false;
-                //}
-                //if (pt == typeof(string) && pt.GetCustomAttribute<RequiredAttribute>() == null) {
-                //    c.IsNullable = true;
-                //}
-            };
+            this.ConfigureExternalServices.EntityService += SetupNullable;
+            this.ConfigureExternalServices.EntityService += SetupLength;
+        }
+
+        /// <summary>
+        /// SetNullable
+        /// </summary>
+        /// <param name="p">属性信息</param>
+        /// <param name="c">列信息</param>
+        public virtual void SetupNullable(PropertyInfo p, EntityColumnInfo c) {
+            var pt = p.PropertyType;
+            //所有类型默认可空
+            bool na = true;
+            //字符串默认可空
+            na = pt == typeof(string) ? true : na;
+            //Nullable<>类型可空
+            if (pt.IsGenericType && pt.GetGenericTypeDefinition() == typeof(Nullable<>)) {
+                na = true;
+            }
+            //RequiredAttribute标记不可空
+            if (p.GetCustomAttribute<RequiredAttribute>() != null) {
+                na = false;
+            }
+            //主键不可以为空
+            if (p.TryGetAttribute<KeyAttribute>(out var _)) {
+                na = false;
+            }
+            //定义主键不可以为空
+            if (p.TryGetAttribute<SugarColumn>(out var sc) && sc.IsPrimaryKey) {
+                na = false;
+            }
+            c.IsNullable = na;
+        }
+        /// <summary>
+        /// Set 长度规则
+        /// </summary>
+        /// <param name="p">属性信息</param>
+        /// <param name="c">列信息</param>
+        public virtual void SetupLength(PropertyInfo p, EntityColumnInfo c) {
+            int len = 0;
+            if (p.TryGetAttribute<MaxLengthAttribute>(out var la)) {
+                len = la.Length;
+            }
+            if (p.TryGetAttribute<SugarColumn>(out var sc) && sc.Length != 0) {
+                len = sc.Length;
+            }
+            c.Length = len;
         }
 
         private static ICacheService? CacheService = null;
@@ -102,7 +116,7 @@ namespace Falcon.SugarApi.DatabaseDefinitions
         /// <param name="serialize">序列化实现</param>
         public void AddDistributedCache(IDistributedCache cache, IJsonSerialize serialize) {
             this.ConfigureExternalServices ??= new ConfigureExternalServices { };
-            this.ConfigureExternalServices.DataInfoCacheService = new DistributedCache(cache,serialize);
+            this.ConfigureExternalServices.DataInfoCacheService = new DistributedCache(cache, serialize);
         }
     }
 }