diff --git a/AMESCoreStudio.WebApi/Models/AMES/NGClass.cs b/AMESCoreStudio.WebApi/Models/AMES/NGClass.cs
index 01661803..31051f49 100644
--- a/AMESCoreStudio.WebApi/Models/AMES/NGClass.cs
+++ b/AMESCoreStudio.WebApi/Models/AMES/NGClass.cs
@@ -19,7 +19,7 @@ namespace AMESCoreStudio.WebApi.Models.AMES
         [Column("NG_CLASS_NO")]
         [Required(ErrorMessage = "{0},不能空白")]
         [Display(Name = "不良類別代碼")]
-        [StringLength(6, ErrorMessage = "{0},不能大于{1}")]
+        [StringLength(20, ErrorMessage = "{0},不能大于{1}")]
         [DataMember]
         public string NGClassNo { get; set; }
 
@@ -30,7 +30,7 @@ namespace AMESCoreStudio.WebApi.Models.AMES
         [Column("NG_GROUP_NO")]
         [Required(ErrorMessage = "{0},不能空白")]
         [Display(Name = "不良群組代碼")]
-        [StringLength(6, ErrorMessage = "{0},不能大于{1}")]
+        [StringLength(20, ErrorMessage = "{0},不能大于{1}")]
         [DataMember]
         public string NGGroupNo { get; set; }
 
diff --git a/AMESCoreStudio.WebApi/Models/AMES/NGGroup.cs b/AMESCoreStudio.WebApi/Models/AMES/NGGroup.cs
index 078fef0d..7a82e7ca 100644
--- a/AMESCoreStudio.WebApi/Models/AMES/NGGroup.cs
+++ b/AMESCoreStudio.WebApi/Models/AMES/NGGroup.cs
@@ -19,7 +19,7 @@ namespace AMESCoreStudio.WebApi.Models.AMES
         [Column("NG_GROUP_NO")]
         [Required(ErrorMessage = "{0},不能空白")]
         [Display(Name = "不良群组代碼")]
-        [StringLength(10, ErrorMessage = "{0},不能大于{1}")]
+        [StringLength(20, ErrorMessage = "{0},不能大于{1}")]
         [DataMember]
         public string NGGroupNo { get; set; }
 
diff --git a/AMESCoreStudio.WebApi/Models/AMES/NGReason.cs b/AMESCoreStudio.WebApi/Models/AMES/NGReason.cs
index 02a30971..311f0bd2 100644
--- a/AMESCoreStudio.WebApi/Models/AMES/NGReason.cs
+++ b/AMESCoreStudio.WebApi/Models/AMES/NGReason.cs
@@ -19,7 +19,7 @@ namespace AMESCoreStudio.WebApi.Models.AMES
         [Column("NG_REASON_NO")]
         [Required(ErrorMessage = "{0},不能空白")]
         [Display(Name = "不良原因代碼")]
-        [StringLength(6, ErrorMessage = "{0},不能大于{1}")]
+        [StringLength(20, ErrorMessage = "{0},不能大于{1}")]
         [DataMember]
         public string NGReasonNo { get; set; }
 
@@ -29,7 +29,7 @@ namespace AMESCoreStudio.WebApi.Models.AMES
         [Column("NG_CLASS_NO")]
         [Required(ErrorMessage = "{0},不能空白")]
         [Display(Name = "不良類別代碼")]
-        [StringLength(6, ErrorMessage = "{0},不能大于{1}")]
+        [StringLength(20, ErrorMessage = "{0},不能大于{1}")]
         [DataMember]
         public string NGClassNo { get; set; }