diff --git a/model/lottery.go b/model/lottery.go
new file mode 100644
index 0000000..557377d
--- /dev/null
+++ b/model/lottery.go
@@ -0,0 +1,27 @@
+package model
+
+import (
+	"database/sql"
+	"math/rand"
+	"time"
+)
+
+// Lottery -
+type Lottery struct {
+	ID      string    `db:"id" cc:"id"`
+	Type    string    `db:"type" cc:"type"`
+	Message string    `db:"message" cc:"message"`
+	Ctime   time.Time `db:"ctime" cc:"ctime"`
+	Mtime   time.Time `db:"mtime" cc:"mtime"`
+}
+
+// GetRandomLotteryByType -
+func GetRandomLotteryByType(t string) (p *Lottery, err error) {
+	p = &Lottery{}
+	offset := rand.Intn(10)
+	err = x.Get(p, `select * from "public"."lottery" where "type" = $1 order by random() offset $2 limit 1`, t, offset)
+	if err == sql.ErrNoRows {
+		return nil, nil
+	}
+	return
+}
diff --git a/module/message-command/line-group.go b/module/message-command/line-group.go
index 777c240..e13e986 100644
--- a/module/message-command/line-group.go
+++ b/module/message-command/line-group.go
@@ -6,6 +6,7 @@ import (
 	"strings"
 
 	"git.trj.tw/golang/mtfosbot/module/apis/twitch"
+	"git.trj.tw/golang/mtfosbot/module/config"
 
 	"git.trj.tw/golang/mtfosbot/model"
 	googleapi "git.trj.tw/golang/mtfosbot/module/apis/google"
@@ -30,6 +31,8 @@ func selectAct(cmd, sub, txt string, s *lineobj.SourceObject) (res string) {
 		return addYoutubeChannel(sub, txt, s)
 	case "delyoutube":
 		return delYoutubeChannel(sub, txt, s)
+	case "lottery":
+		return lottery(sub, txt, s)
 	case "hello":
 		return "World!!"
 	}
@@ -321,7 +324,7 @@ func delYoutubeChannel(sub, txt string, s *lineobj.SourceObject) (res string) {
 		return "channel not exists"
 	}
 	rt := &model.LineYoutubeRT{
-		Line: s.GroupID,
+		Line:    s.GroupID,
 		Youtube: ytData.ID,
 	}
 	err = rt.DelRT()
@@ -330,3 +333,26 @@ func delYoutubeChannel(sub, txt string, s *lineobj.SourceObject) (res string) {
 	}
 	return "Success"
 }
+
+func lottery(sub, txt string, s *lineobj.SourceObject) (res string) {
+	if len(sub) == 0 {
+		return ""
+	}
+	data, err := model.GetRandomLotteryByType(sub)
+	if err != nil || data == nil {
+		return
+	}
+	conf := config.GetConf()
+	u := conf.URL
+	if last := len(u); last > 0 && u[last-1] == '/' {
+		u = u[:last]
+	}
+	oriURL := "/image/origin"
+	thumbURL := "/image/thumbnail"
+	if len(data.Message) == 0 {
+		return
+	}
+	o := u + oriURL + "/" + data.Message + "?d=" + sub
+	t := u + thumbURL + "/" + data.Message + "?d=" + sub
+	return fmt.Sprintf("$image$%s;%s", o, t)
+}
diff --git a/router/rimg/rimg.go b/router/rimg/rimg.go
index cf4437d..5ed9e14 100644
--- a/router/rimg/rimg.go
+++ b/router/rimg/rimg.go
@@ -45,6 +45,16 @@ func GetOriginImage(c *context.Context) {
 		return
 	}
 
+	subd := c.DefaultQuery("d", "")
+	if len(subd) > 0 {
+		imgP = path.Join(imgP, subd)
+		exists = utils.CheckExists(imgP, true)
+		if !exists {
+			c.NotFound("image path not found")
+			return
+		}
+	}
+
 	newP := path.Join(imgP, fname)
 	exists = utils.CheckExists(newP, false)
 	if !exists {
@@ -126,11 +136,20 @@ func GetThumbnailImage(c *context.Context) {
 		return
 	}
 
-	thumbP := path.Join(imgP, "thumbnail", fname)
+	thumbDir := "thumbnail"
+	subd := c.DefaultQuery("d", "")
+	if exists := utils.CheckExists(path.Join(imgP, thumbDir, subd), true); !exists {
+		if err := os.MkdirAll(path.Join(imgP, thumbDir, subd), 0775); err != nil {
+			c.ServerError(nil)
+			return
+		}
+	}
+
+	thumbP := path.Join(imgP, thumbDir, subd, fname)
 	genNew := false
 	if !utils.CheckExists(thumbP, false) {
 		genNew = true
-		thumbP = path.Join(imgP, fname)
+		thumbP = path.Join(imgP, subd, fname)
 		exists = utils.CheckExists(thumbP, false)
 		if !exists {
 			c.NotFound("image file not found")
@@ -174,7 +193,7 @@ func GetThumbnailImage(c *context.Context) {
 		breader := bytes.NewReader(buf.Bytes())
 
 		if genNew {
-			savep := path.Join(conf.ImageRoot, "thumbnail", fname)
+			savep := path.Join(conf.ImageRoot, "thumbnail", subd, fname)
 			err := saveNewThumbnail(breader, savep)
 			if err != nil {
 				c.ServerError(nil)