diff --git a/types/db.go b/types/db.go
index 1ef2dd3..35b4370 100644
--- a/types/db.go
+++ b/types/db.go
@@ -18,10 +18,16 @@ type (
 		Debug     bool
 	}
 
+	// standard ID,Identity definition.
+	Std_IDIdentity struct {
+		ID       uint   `gorm:"primarykey;"  json:"id"`
+		Identity string `gorm:"column:identity;type:varchar(36);uniqueIndex;"  json:"identity"` // 唯一标识，24位NanoID,36位为ULID
+	}
+
 	// standard ID,Created,Updated,Deleted definition.
 	Std_IICUDS struct {
 		ID        uint           `gorm:"primarykey;"  json:"id"`
-		Identity  string         `gorm:"column:identity;type:varchar(36);uniqueIndex;"  json:"identity"` // 唯一标识，24位NanoID,36位为UUID
+		Identity  string         `gorm:"column:identity;type:varchar(36);uniqueIndex;"  json:"identity"` // 唯一标识，24位NanoID,36位为ULID
 		CreatedAt time.Time      `json:"created_at"`
 		UpdatedAt time.Time      `json:"updated_at"`
 		DeletedAt gorm.DeletedAt `gorm:"index;" json:"deleted_at"`
@@ -45,7 +51,7 @@ type (
 	// standard PassportID,PassportIdentity definition.
 	Std_Passport struct {
 		PassportID       uint   `gorm:"column:passport_id;Index;" json:"passport_id"`
-		PassportIdentity string `gorm:"column:passport_identity;type:varchar(36);Index;"  json:"passport_identity"` // 用户唯一标识，24位NanoID,36位为UUID
+		PassportIdentity string `gorm:"column:passport_identity;type:varchar(36);Index;"  json:"passport_identity"` // 用户唯一标识，24位NanoID,36位为ULID
 	}
 
 	// standard ID definition.
@@ -55,7 +61,7 @@ type (
 
 	// standard Identity definition.
 	Std_Identity struct {
-		Identity string `gorm:"column:identity;type:varchar(36);uniqueIndex;"  json:"identity"` // 唯一标识，24位NanoID,36位为UUID
+		Identity string `gorm:"column:identity;type:varchar(36);uniqueIndex;"  json:"identity"` // 唯一标识，24位NanoID,36位为ULID
 	}
 
 	// standard Status definition.