diff --git a/model/park.go b/model/park.go
index 437475c..3c093df 100644
--- a/model/park.go
+++ b/model/park.go
@@ -3,6 +3,7 @@ package model
 import (
 	"time"
 
+	"github.com/jinzhu/copier"
 	"github.com/shopspring/decimal"
 	"github.com/uptrace/bun"
 )
@@ -64,3 +65,9 @@ type ParkPeriodStatistics struct {
 	Name   string     `bun:",notnull" json:"name"`
 	Period *time.Time `bun:"type:date" json:"period" time_format:"simple_date" time_location:"shanghai"`
 }
+
+func FromPark(park Park) ParkSimplified {
+	dest := ParkSimplified{}
+	copier.Copy(&dest, park)
+	return dest
+}
diff --git a/model/user_detail.go b/model/user_detail.go
index d28984d..5a7257e 100644
--- a/model/user_detail.go
+++ b/model/user_detail.go
@@ -3,6 +3,7 @@ package model
 import (
 	"time"
 
+	"github.com/jinzhu/copier"
 	"github.com/shopspring/decimal"
 	"github.com/uptrace/bun"
 )
@@ -45,3 +46,9 @@ type UserDetailSimplified struct {
 	Contact       *string `json:"contact"`
 	Phone         *string `json:"phone"`
 }
+
+func FromUserDetail(user UserDetail) UserDetailSimplified {
+	dest := UserDetailSimplified{}
+	copier.Copy(&dest, user)
+	return dest
+}