diff --git a/relations.go b/relations.go
index 69d2478..0206217 100644
--- a/relations.go
+++ b/relations.go
@@ -5,6 +5,7 @@ import (
 	"fmt"
 	"os"
 	"strings"
+	"time"
 )
 
 type Friend struct{ *User }
@@ -108,8 +109,11 @@ func (f Friends) Search(limit int, condFuncList ...func(friend *Friend) bool) (r
 }
 
 // 向slice的好友依次发送消息
-func (f Friends) SendMsg(msg *SendMessage) error {
+func (f Friends) SendMsg(msg *SendMessage, delay ...time.Duration) error {
 	for _, friend := range f {
+		if len(delay) != 0 {
+			time.Sleep(delay[0])
+		}
 		if err := friend.SendMsg(msg); err != nil {
 			return err
 		}
@@ -118,8 +122,11 @@ func (f Friends) SendMsg(msg *SendMessage) error {
 }
 
 // 向slice的好友依次发送文本消息
-func (f Friends) SendText(text string) error {
+func (f Friends) SendText(text string, delay ...time.Duration) error {
 	for _, friend := range f {
+		if len(delay) != 0 {
+			time.Sleep(delay[0])
+		}
 		if err := friend.SendText(text); err != nil {
 			return err
 		}
@@ -127,6 +134,18 @@ func (f Friends) SendText(text string) error {
 	return nil
 }
 
+func (f Friends) SendImage(file *os.File, delay ...time.Duration) error {
+	for _, friend := range f {
+		if len(delay) != 0 {
+			time.Sleep(delay[0])
+		}
+		if err := friend.SendImage(file); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
 type Group struct{ *User }
 
 // implement fmt.Stringer
@@ -227,6 +246,42 @@ func (g Groups) Last() *Group {
 	return nil
 }
 
+func (g Groups) SendMsg(msg *SendMessage, delay ...time.Duration) error {
+	for _, group := range g {
+		if len(delay) != 0 {
+			time.Sleep(delay[0])
+		}
+		if err := group.SendMsg(msg); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func (g Groups) SendText(text string, delay ...time.Duration) error {
+	for _, group := range g {
+		if len(delay) != 0 {
+			time.Sleep(delay[0])
+		}
+		if err := group.SendText(text); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func (g Groups) SendImage(file *os.File, delay ...time.Duration) error {
+	for _, group := range g {
+		if len(delay) != 0 {
+			time.Sleep(delay[0])
+		}
+		if err := group.SendImage(file); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
 func (g Groups) SearchByUserName(limit int, username string) (results Groups) {
 	return g.Search(limit, func(group *Group) bool { return group.UserName == username })
 }