diff --git a/model/attachment.go b/model/attachment.go
new file mode 100644
index 0000000..990055a
--- /dev/null
+++ b/model/attachment.go
@@ -0,0 +1,42 @@
+package model
+
+import (
+	"go-gin/pkg/utils"
+
+	"gorm.io/gorm"
+)
+
+type Attachment struct {
+	Common
+	Num         string `json:"num,omitempty" gorm:"column:num"`
+	Name        string `json:"name,omitempty" gorm:"column:name"`
+	SavePath    string `json:"-" gorm:"column:save_path"`
+	MD5         string `json:"md5,omitempty" gorm:"column:md5"`
+	Description string `json:"description,omitempty" gorm:"column:description"`
+	Url         string `json:"url,omitempty" gorm:"-"`
+	Size        int64  `json:"size,omitempty" gorm:"column:size"`
+	MiMe        string `json:"mime,omitempty" gorm:"column:mime"`
+	CreatedUser uint64 `json:"created_user,omitempty" gorm:"column:created_user"`
+	CoverUrl    string `json:"cover_url,omitempty" gorm:"column:cover_url"`
+	Width       int    `json:"width,omitempty" gorm:"column:width"`
+	Height      int    `json:"height,omitempty" gorm:"column:height"`
+	ExtConfig   string `json:"ext_config,omitempty" gorm:"column:ext_config"`
+}
+
+func (a *Attachment) Create(db *gorm.DB) (err error) {
+	if a.Num == "" {
+		a.Num = utils.GenHexStr(32)
+	}
+	err = db.Model(&Attachment{}).Create(&a).Error
+	return err
+}
+
+func (a *Attachment) GetByNum(db *gorm.DB, num string) (attachment Attachment, err error) {
+	err = db.Model(&Attachment{}).Where("num = ?", num).First(&attachment).Error
+	return attachment, err
+}
+
+func (a *Attachment) GetByMD5(db *gorm.DB, md5 string) (attachment Attachment, err error) {
+	err = db.Model(&Attachment{}).Where("md5 = ?", md5).First(&attachment).Error
+	return attachment, err
+}