diff --git a/caller.go b/caller.go
index 3083e53..3399d72 100644
--- a/caller.go
+++ b/caller.go
@@ -260,7 +260,12 @@ func (c *Caller) UploadMedia(file *os.File, request *BaseRequest, info *LoginInf
 }
 
 // WebWxSendImageMsg 发送图片消息接口
-func (c *Caller) WebWxSendImageMsg(file *os.File, request *BaseRequest, info *LoginInfo, fromUserName, toUserName string) (*SentMessage, error) {
+func (c *Caller) WebWxSendImageMsg(reader io.Reader, request *BaseRequest, info *LoginInfo, fromUserName, toUserName string) (*SentMessage, error) {
+	file, cb, err := readerToFile(reader)
+	if err != nil {
+		return nil, err
+	}
+	defer cb()
 	// 首先尝试上传图片
 	var mediaId string
 	{
@@ -282,7 +287,12 @@ func (c *Caller) WebWxSendImageMsg(file *os.File, request *BaseRequest, info *Lo
 	return parser.SentMessage(msg)
 }
 
-func (c *Caller) WebWxSendFile(file *os.File, req *BaseRequest, info *LoginInfo, fromUserName, toUserName string) (*SentMessage, error) {
+func (c *Caller) WebWxSendFile(reader io.Reader, req *BaseRequest, info *LoginInfo, fromUserName, toUserName string) (*SentMessage, error) {
+	file, cb, err := readerToFile(reader)
+	if err != nil {
+		return nil, err
+	}
+	defer cb()
 	resp, err := c.UploadMedia(file, req, info, fromUserName, toUserName)
 	if err != nil {
 		return nil, err
@@ -298,7 +308,12 @@ func (c *Caller) WebWxSendFile(file *os.File, req *BaseRequest, info *LoginInfo,
 	return c.WebWxSendAppMsg(msg, req)
 }
 
-func (c *Caller) WebWxSendVideoMsg(file *os.File, request *BaseRequest, info *LoginInfo, fromUserName, toUserName string) (*SentMessage, error) {
+func (c *Caller) WebWxSendVideoMsg(reader io.Reader, request *BaseRequest, info *LoginInfo, fromUserName, toUserName string) (*SentMessage, error) {
+	file, cb, err := readerToFile(reader)
+	if err != nil {
+		return nil, err
+	}
+	defer cb()
 	var mediaId string
 	{
 		resp, err := c.UploadMedia(file, request, info, fromUserName, toUserName)
@@ -500,3 +515,32 @@ func (p *MessageResponseParser) SentMessage(msg *SendMessage) (*SentMessage, err
 	}
 	return &SentMessage{MsgId: msgID, SendMessage: msg}, nil
 }
+
+func readerToFile(reader io.Reader) (file *os.File, cb func(), err error) {
+	if file, ok := reader.(*os.File); ok {
+		return file, func() {}, nil
+	}
+	file, err = os.CreateTemp("", "*")
+	if err != nil {
+		return nil, nil, err
+	}
+	_, err = io.Copy(file, reader)
+	if err != nil {
+		_ = file.Close()
+		_ = os.Remove(file.Name())
+		return nil, nil, err
+	}
+	if err = file.Close(); err != nil {
+		_ = os.Remove(file.Name())
+		return nil, nil, err
+	}
+	file, err = os.Open(file.Name())
+	if err != nil {
+		_ = os.Remove(file.Name())
+		return nil, nil, err
+	}
+	return file, func() {
+		_ = file.Close()
+		_ = os.Remove(file.Name())
+	}, nil
+}
diff --git a/client.go b/client.go
index b9b5ca1..d6de48d 100644
--- a/client.go
+++ b/client.go
@@ -4,6 +4,7 @@ import (
 	"bufio"
 	"bytes"
 	"crypto/md5"
+	"encoding/hex"
 	"encoding/json"
 	"fmt"
 	"io"
@@ -11,6 +12,7 @@ import (
 	"net/http"
 	"net/url"
 	"os"
+	"path/filepath"
 	"strconv"
 	"strings"
 	"sync"
@@ -310,15 +312,22 @@ func (c *Client) WebWxUploadMediaByChunk(file *os.File, request *BaseRequest, in
 		return nil, err
 	}
 
-	fileMd5 := fmt.Sprintf("%x", h.Sum(nil))
+	fileMd5 := hex.EncodeToString(h.Sum(nil))
 
 	sate, err := file.Stat()
 	if err != nil {
 		return nil, err
 	}
 
+	filename := sate.Name()
+
+	if ext := filepath.Ext(filename); ext == "" {
+		names := strings.Split(contentType, "/")
+		filename = filename + "." + names[len(names)-1]
+	}
+
 	// 获取文件的类型
-	mediaType := getMessageType(sate.Name())
+	mediaType := getMessageType(filename)
 
 	path, _ := url.Parse(c.Domain.FileHost() + webwxuploadmedia)
 	params := url.Values{}
@@ -362,7 +371,7 @@ func (c *Client) WebWxUploadMediaByChunk(file *os.File, request *BaseRequest, in
 
 	content := map[string]string{
 		"id":                "WU_FILE_0",
-		"name":              file.Name(),
+		"name":              filename,
 		"type":              contentType,
 		"lastModifiedDate":  sate.ModTime().Format(TimeFormat),
 		"size":              strconv.FormatInt(sate.Size(), 10),
diff --git a/message.go b/message.go
index 6d358c3..afaeb16 100644
--- a/message.go
+++ b/message.go
@@ -165,7 +165,7 @@ func (m *Message) ReplyText(content string) (*SentMessage, error) {
 }
 
 // ReplyImage 回复图片消息
-func (m *Message) ReplyImage(file *os.File) (*SentMessage, error) {
+func (m *Message) ReplyImage(file io.Reader) (*SentMessage, error) {
 	info := m.bot.Storage.LoginInfo
 	request := m.bot.Storage.Request
 	sentMessage, err := m.bot.Caller.WebWxSendImageMsg(file, request, info, m.bot.self.UserName, m.FromUserName)
@@ -173,7 +173,7 @@ func (m *Message) ReplyImage(file *os.File) (*SentMessage, error) {
 }
 
 // ReplyVideo 回复视频消息
-func (m *Message) ReplyVideo(file *os.File) (*SentMessage, error) {
+func (m *Message) ReplyVideo(file io.Reader) (*SentMessage, error) {
 	info := m.bot.Storage.LoginInfo
 	request := m.bot.Storage.Request
 	sentMessage, err := m.bot.Caller.WebWxSendVideoMsg(file, request, info, m.bot.self.UserName, m.FromUserName)
@@ -181,7 +181,7 @@ func (m *Message) ReplyVideo(file *os.File) (*SentMessage, error) {
 }
 
 // ReplyFile 回复文件消息
-func (m *Message) ReplyFile(file *os.File) (*SentMessage, error) {
+func (m *Message) ReplyFile(file io.Reader) (*SentMessage, error) {
 	info := m.bot.Storage.LoginInfo
 	request := m.bot.Storage.Request
 	sentMessage, err := m.bot.Caller.WebWxSendFile(file, request, info, m.bot.self.UserName, m.FromUserName)
diff --git a/relations.go b/relations.go
index c29124e..a8cb9c1 100644
--- a/relations.go
+++ b/relations.go
@@ -2,7 +2,7 @@ package openwechat
 
 import (
 	"fmt"
-	"os"
+	"io"
 	"time"
 )
 
@@ -24,17 +24,17 @@ func (f *Friend) SendText(content string) (*SentMessage, error) {
 }
 
 // SendImage 发送图片消息
-func (f *Friend) SendImage(file *os.File) (*SentMessage, error) {
+func (f *Friend) SendImage(file io.Reader) (*SentMessage, error) {
 	return f.self.SendImageToFriend(f, file)
 }
 
 // SendVideo 发送视频消息
-func (f *Friend) SendVideo(file *os.File) (*SentMessage, error) {
+func (f *Friend) SendVideo(file io.Reader) (*SentMessage, error) {
 	return f.self.SendVideoToFriend(f, file)
 }
 
 // SendFile 发送文件消息
-func (f *Friend) SendFile(file *os.File) (*SentMessage, error) {
+func (f *Friend) SendFile(file io.Reader) (*SentMessage, error) {
 	return f.self.SendFileToFriend(f, file)
 }
 
@@ -117,7 +117,7 @@ func (f Friends) SendText(text string, delays ...time.Duration) error {
 }
 
 // SendImage 向slice的好友依次发送图片消息
-func (f Friends) SendImage(file *os.File, delays ...time.Duration) error {
+func (f Friends) SendImage(file io.Reader, delays ...time.Duration) error {
 	if f.Count() == 0 {
 		return nil
 	}
@@ -130,7 +130,7 @@ func (f Friends) SendImage(file *os.File, delays ...time.Duration) error {
 }
 
 // SendFile 群发文件
-func (f Friends) SendFile(file *os.File, delay ...time.Duration) error {
+func (f Friends) SendFile(file io.Reader, delay ...time.Duration) error {
 	if f.Count() == 0 {
 		return nil
 	}
@@ -155,17 +155,17 @@ func (g *Group) SendText(content string) (*SentMessage, error) {
 }
 
 // SendImage 发行图片消息给当前的群组
-func (g *Group) SendImage(file *os.File) (*SentMessage, error) {
+func (g *Group) SendImage(file io.Reader) (*SentMessage, error) {
 	return g.self.SendImageToGroup(g, file)
 }
 
 // SendVideo 发行视频消息给当前的群组
-func (g *Group) SendVideo(file *os.File) (*SentMessage, error) {
+func (g *Group) SendVideo(file io.Reader) (*SentMessage, error) {
 	return g.self.SendVideoToGroup(g, file)
 }
 
 // SendFile 发送文件给当前的群组
-func (g *Group) SendFile(file *os.File) (*SentMessage, error) {
+func (g *Group) SendFile(file io.Reader) (*SentMessage, error) {
 	return g.self.SendFileToGroup(g, file)
 }
 
@@ -254,7 +254,7 @@ func (g Groups) SendText(text string, delay ...time.Duration) error {
 }
 
 // SendImage 向群组依次发送图片消息, 支持发送延迟
-func (g Groups) SendImage(file *os.File, delay ...time.Duration) error {
+func (g Groups) SendImage(file io.Reader, delay ...time.Duration) error {
 	if g.Count() == 0 {
 		return nil
 	}
@@ -267,7 +267,7 @@ func (g Groups) SendImage(file *os.File, delay ...time.Duration) error {
 }
 
 // SendFile 向群组依次发送文件消息, 支持发送延迟
-func (g Groups) SendFile(file *os.File, delay ...time.Duration) error {
+func (g Groups) SendFile(file io.Reader, delay ...time.Duration) error {
 	if g.Count() == 0 {
 		return nil
 	}
@@ -385,12 +385,12 @@ func (m *Mp) SendText(content string) (*SentMessage, error) {
 }
 
 // SendImage 发送图片消息给公众号
-func (m *Mp) SendImage(file *os.File) (*SentMessage, error) {
+func (m *Mp) SendImage(file io.Reader) (*SentMessage, error) {
 	return m.self.SendImageToMp(m, file)
 }
 
 // SendFile 发送文件消息给公众号
-func (m *Mp) SendFile(file *os.File) (*SentMessage, error) {
+func (m *Mp) SendFile(file io.Reader) (*SentMessage, error) {
 	return m.self.SendFileToMp(m, file)
 }
 
diff --git a/user.go b/user.go
index f2aeb16..c69211c 100644
--- a/user.go
+++ b/user.go
@@ -295,21 +295,21 @@ func (s *Self) sendTextToUser(user *User, text string) (*SentMessage, error) {
 	return s.sendMessageWrapper(sentMessage, err)
 }
 
-func (s *Self) sendImageToUser(user *User, file *os.File) (*SentMessage, error) {
+func (s *Self) sendImageToUser(user *User, file io.Reader) (*SentMessage, error) {
 	req := s.bot.Storage.Request
 	info := s.bot.Storage.LoginInfo
 	sentMessage, err := s.bot.Caller.WebWxSendImageMsg(file, req, info, s.UserName, user.UserName)
 	return s.sendMessageWrapper(sentMessage, err)
 }
 
-func (s *Self) sendVideoToUser(user *User, file *os.File) (*SentMessage, error) {
+func (s *Self) sendVideoToUser(user *User, file io.Reader) (*SentMessage, error) {
 	req := s.bot.Storage.Request
 	info := s.bot.Storage.LoginInfo
 	sentMessage, err := s.bot.Caller.WebWxSendVideoMsg(file, req, info, s.UserName, user.UserName)
 	return s.sendMessageWrapper(sentMessage, err)
 }
 
-func (s *Self) sendFileToUser(user *User, file *os.File) (*SentMessage, error) {
+func (s *Self) sendFileToUser(user *User, file io.Reader) (*SentMessage, error) {
 	req := s.bot.Storage.Request
 	info := s.bot.Storage.LoginInfo
 	sentMessage, err := s.bot.Caller.WebWxSendFile(file, req, info, s.UserName, user.UserName)
@@ -322,17 +322,17 @@ func (s *Self) SendTextToFriend(friend *Friend, text string) (*SentMessage, erro
 }
 
 // SendImageToFriend 发送图片消息给好友
-func (s *Self) SendImageToFriend(friend *Friend, file *os.File) (*SentMessage, error) {
+func (s *Self) SendImageToFriend(friend *Friend, file io.Reader) (*SentMessage, error) {
 	return s.sendImageToUser(friend.User, file)
 }
 
 // SendVideoToFriend 发送视频给好友
-func (s *Self) SendVideoToFriend(friend *Friend, file *os.File) (*SentMessage, error) {
+func (s *Self) SendVideoToFriend(friend *Friend, file io.Reader) (*SentMessage, error) {
 	return s.sendVideoToUser(friend.User, file)
 }
 
 // SendFileToFriend 发送文件给好友
-func (s *Self) SendFileToFriend(friend *Friend, file *os.File) (*SentMessage, error) {
+func (s *Self) SendFileToFriend(friend *Friend, file io.Reader) (*SentMessage, error) {
 	return s.sendFileToUser(friend.User, file)
 }
 
@@ -441,17 +441,17 @@ func (s *Self) SendTextToGroup(group *Group, text string) (*SentMessage, error)
 }
 
 // SendImageToGroup 发送图片消息给群组
-func (s *Self) SendImageToGroup(group *Group, file *os.File) (*SentMessage, error) {
+func (s *Self) SendImageToGroup(group *Group, file io.Reader) (*SentMessage, error) {
 	return s.sendImageToUser(group.User, file)
 }
 
 // SendVideoToGroup 发送视频给群组
-func (s *Self) SendVideoToGroup(group *Group, file *os.File) (*SentMessage, error) {
+func (s *Self) SendVideoToGroup(group *Group, file io.Reader) (*SentMessage, error) {
 	return s.sendVideoToUser(group.User, file)
 }
 
 // SendFileToGroup 发送文件给群组
-func (s *Self) SendFileToGroup(group *Group, file *os.File) (*SentMessage, error) {
+func (s *Self) SendFileToGroup(group *Group, file io.Reader) (*SentMessage, error) {
 	return s.sendFileToUser(group.User, file)
 }
 
@@ -530,7 +530,7 @@ func (s *Self) sendTextToMembers(text string, delay time.Duration, members ...*U
 }
 
 // sendImageToMembers 发送图片消息给群组或者好友
-func (s *Self) sendImageToMembers(img *os.File, delay time.Duration, members ...*User) error {
+func (s *Self) sendImageToMembers(img io.Reader, delay time.Duration, members ...*User) error {
 	if len(members) == 0 {
 		return nil
 	}
@@ -544,7 +544,7 @@ func (s *Self) sendImageToMembers(img *os.File, delay time.Duration, members ...
 }
 
 // sendVideoToMembers 发送视频消息给群组或者好友
-func (s *Self) sendVideoToMembers(video *os.File, delay time.Duration, members ...*User) error {
+func (s *Self) sendVideoToMembers(video io.Reader, delay time.Duration, members ...*User) error {
 	if len(members) == 0 {
 		return nil
 	}
@@ -557,7 +557,7 @@ func (s *Self) sendVideoToMembers(video *os.File, delay time.Duration, members .
 	return s.forwardMessage(msg, delay, members[1:]...)
 }
 
-func (s *Self) sendFileToMembers(file *os.File, delay time.Duration, members ...*User) error {
+func (s *Self) sendFileToMembers(file io.Reader, delay time.Duration, members ...*User) error {
 	if len(members) == 0 {
 		return nil
 	}
@@ -577,19 +577,19 @@ func (s *Self) SendTextToFriends(text string, delay time.Duration, friends ...*F
 }
 
 // SendImageToFriends 发送图片消息给好友
-func (s *Self) SendImageToFriends(img *os.File, delay time.Duration, friends ...*Friend) error {
+func (s *Self) SendImageToFriends(img io.Reader, delay time.Duration, friends ...*Friend) error {
 	members := Friends(friends).AsMembers()
 	return s.sendImageToMembers(img, delay, members...)
 }
 
 // SendFileToFriends 发送文件给好友
-func (s *Self) SendFileToFriends(file *os.File, delay time.Duration, friends ...*Friend) error {
+func (s *Self) SendFileToFriends(file io.Reader, delay time.Duration, friends ...*Friend) error {
 	members := Friends(friends).AsMembers()
 	return s.sendFileToMembers(file, delay, members...)
 }
 
 // SendVideoToFriends 发送视频给好友
-func (s *Self) SendVideoToFriends(video *os.File, delay time.Duration, friends ...*Friend) error {
+func (s *Self) SendVideoToFriends(video io.Reader, delay time.Duration, friends ...*Friend) error {
 	members := Friends(friends).AsMembers()
 	return s.sendVideoToMembers(video, delay, members...)
 }
@@ -601,19 +601,19 @@ func (s *Self) SendTextToGroups(text string, delay time.Duration, groups ...*Gro
 }
 
 // SendImageToGroups 发送图片消息给群组
-func (s *Self) SendImageToGroups(img *os.File, delay time.Duration, groups ...*Group) error {
+func (s *Self) SendImageToGroups(img io.Reader, delay time.Duration, groups ...*Group) error {
 	members := Groups(groups).AsMembers()
 	return s.sendImageToMembers(img, delay, members...)
 }
 
 // SendFileToGroups 发送文件给群组
-func (s *Self) SendFileToGroups(file *os.File, delay time.Duration, groups ...*Group) error {
+func (s *Self) SendFileToGroups(file io.Reader, delay time.Duration, groups ...*Group) error {
 	members := Groups(groups).AsMembers()
 	return s.sendFileToMembers(file, delay, members...)
 }
 
 // SendVideoToGroups 发送视频给群组
-func (s *Self) SendVideoToGroups(video *os.File, delay time.Duration, groups ...*Group) error {
+func (s *Self) SendVideoToGroups(video io.Reader, delay time.Duration, groups ...*Group) error {
 	members := Groups(groups).AsMembers()
 	return s.sendVideoToMembers(video, delay, members...)
 }
@@ -798,17 +798,17 @@ func (s *Self) SendTextToMp(mp *Mp, text string) (*SentMessage, error) {
 }
 
 // SendImageToMp 发送图片消息给公众号
-func (s *Self) SendImageToMp(mp *Mp, file *os.File) (*SentMessage, error) {
+func (s *Self) SendImageToMp(mp *Mp, file io.Reader) (*SentMessage, error) {
 	return s.sendImageToUser(mp.User, file)
 }
 
 // SendFileToMp 发送文件给公众号
-func (s *Self) SendFileToMp(mp *Mp, file *os.File) (*SentMessage, error) {
+func (s *Self) SendFileToMp(mp *Mp, file io.Reader) (*SentMessage, error) {
 	return s.sendFileToUser(mp.User, file)
 }
 
 // SendVideoToMp 发送视频消息给公众号
-func (s *Self) SendVideoToMp(mp *Mp, file *os.File) (*SentMessage, error) {
+func (s *Self) SendVideoToMp(mp *Mp, file io.Reader) (*SentMessage, error) {
 	return s.sendVideoToUser(mp.User, file)
 }