diff --git a/internal/api/router.go b/internal/api/router.go
index 1003ff62b..e9fde37ee 100644
--- a/internal/api/router.go
+++ b/internal/api/router.go
@@ -171,6 +171,8 @@ func newGinRouter(ctx context.Context, client discovery.SvcDiscoveryRegistry, co
 		userRouterGroup.POST("/set_call_accept_setting", u.SetCallAcceptSetting)
 		userRouterGroup.POST("/set_msg_receive_setting", u.SetMsgReceiveSetting)
 		userRouterGroup.POST("/set_group_invite_setting", u.SetGroupInviteSetting)
+		// 设置用户全局阅后即焚时长（秒），0 表示关闭
+		userRouterGroup.POST("/set_user_msg_burn_duration", u.SetUserMsgBurnDuration)
 		// 根据手机号精确查找用户（phoneSearchVisibility=true 时遵守 phone_visibility 设置）
 		userRouterGroup.POST("/get_user_by_phone", u.GetUserByPhone)
 		// 根据昵称精确查询用户（可多结果，与 getPaginationUsers 模糊搜索不同）
diff --git a/internal/api/user.go b/internal/api/user.go
index d5c8b4203..aa82589a7 100644
--- a/internal/api/user.go
+++ b/internal/api/user.go
@@ -355,6 +355,10 @@ func (u *UserApi) SetGroupInviteSetting(c *gin.Context) {
 	a2r.Call(c, user.UserClient.SetGroupInviteSetting, u.Client)
 }
 
+func (u *UserApi) SetUserMsgBurnDuration(c *gin.Context) {
+	a2r.Call(c, user.UserClient.SetUserMsgBurnDuration, u.Client)
+}
+
 func (u *UserApi) GetUserByPhone(c *gin.Context) {
 	a2r.Call(c, user.UserClient.GetUserByPhone, u.Client)
 }
diff --git a/internal/rpc/user/user.go b/internal/rpc/user/user.go
index d5d3a84a1..1cd47121d 100644
--- a/internal/rpc/user/user.go
+++ b/internal/rpc/user/user.go
@@ -424,6 +424,37 @@ func (s *userServer) SetGroupInviteSetting(ctx context.Context, req *pbuser.SetG
 	return &pbuser.SetGroupInviteSettingResp{}, nil
 }
 
+// SetUserMsgBurnDuration 设置用户全局消息阅后即焚时长（秒）；0 表示关闭，要求 >=0。
+// 只允许本人或管理员操作。
+func (s *userServer) SetUserMsgBurnDuration(ctx context.Context, req *pbuser.SetUserMsgBurnDurationReq) (*pbuser.SetUserMsgBurnDurationResp, error) {
+	if req.UserID == "" {
+		return nil, errs.ErrArgs.WrapMsg("userID is required")
+	}
+	if req.MsgBurnDuration < 0 {
+		return nil, errs.ErrArgs.WrapMsg("msgBurnDuration must be >= 0 (seconds)")
+	}
+	if err := authverify.CheckAccessV3(ctx, req.UserID, s.config.Share.IMAdminUserID); err != nil {
+		log.ZWarn(ctx, "SetUserMsgBurnDuration: access denied", err,
+			"opUserID", mcontext.GetOpUserID(ctx), "targetUserID", req.UserID)
+		return nil, err
+	}
+	if _, err := s.db.FindWithError(ctx, []string{req.UserID}); err != nil {
+		log.ZError(ctx, "SetUserMsgBurnDuration: user not found or db error", err,
+			"opUserID", mcontext.GetOpUserID(ctx), "targetUserID", req.UserID)
+		return nil, err
+	}
+	if err := s.db.UpdateByMap(ctx, req.UserID, map[string]any{
+		"msg_burn_duration": req.MsgBurnDuration,
+	}); err != nil {
+		log.ZError(ctx, "SetUserMsgBurnDuration: UpdateByMap failed", err,
+			"opUserID", mcontext.GetOpUserID(ctx), "targetUserID", req.UserID,
+			"msgBurnDuration", req.MsgBurnDuration)
+		return nil, err
+	}
+	s.friendNotificationSender.UserInfoUpdatedNotification(ctx, req.UserID)
+	return &pbuser.SetUserMsgBurnDurationResp{}, nil
+}
+
 // GetUserByPhone 根据精确手机号查询用户。
 //
 // phone_visibility 仅控制用户资料中手机号字段是否展示，不影响搜索本身：
diff --git a/pkg/common/convert/user.go b/pkg/common/convert/user.go
index 1a45d6ff8..8098b416d 100644
--- a/pkg/common/convert/user.go
+++ b/pkg/common/convert/user.go
@@ -52,6 +52,7 @@ func UserDB2Pb(user *relationtb.User) *sdkws.UserInfo {
 		MsgReceiveSetting:  user.MsgReceiveSetting,
 		GroupInviteSetting: user.GroupInviteSetting,
 		CallRingtoneURL:    user.CallRingtoneURL,
+		MsgBurnDuration:    user.MsgBurnDuration,
 	}
 }
 
@@ -92,6 +93,7 @@ func UserPb2DBMap(user *sdkws.UserInfo) map[string]any {
 		"app_manager_level":   user.AppMangerLevel,
 		"global_recv_msg_opt": user.GlobalRecvMsgOpt,
 		"call_ringtone_url":   user.CallRingtoneURL,
+		"msg_burn_duration":   user.MsgBurnDuration,
 	}
 	for key, value := range fields {
 		if v, ok := value.(string); ok && v != "" {
@@ -163,5 +165,8 @@ func UserPb2DBMapEx(user *sdkws.UserInfoWithEx) map[string]any {
 	if user.CallRingtoneURL != nil {
 		val["call_ringtone_url"] = user.CallRingtoneURL.Value
 	}
+	if user.MsgBurnDuration != nil {
+		val["msg_burn_duration"] = user.MsgBurnDuration.Value
+	}
 	return val
 }
diff --git a/pkg/common/storage/model/user.go b/pkg/common/storage/model/user.go
index dea729a49..e880e1255 100644
--- a/pkg/common/storage/model/user.go
+++ b/pkg/common/storage/model/user.go
@@ -79,6 +79,8 @@ type User struct {
 	CallRingtoneURL string `bson:"call_ringtone_url"`
 	// Status 账号状态：0=正常，1=冻结，2=黑名单
 	Status int32 `bson:"status"`
+	// MsgBurnDuration 用户全局消息阅后即焚时长（秒）；0 表示关闭
+	MsgBurnDuration int32 `bson:"msg_burn_duration"`
 }
 
 func (u *User) GetNickname() string {
diff --git a/protocol b/protocol
index de7a73dfc..49fe436a9 160000
--- a/protocol
+++ b/protocol
@@ -1 +1 @@
-Subproject commit de7a73dfcf97ac618dacdad970da0f3cbd7f0ac8
+Subproject commit 49fe436a9a00d4b5a2e86f728cdd34156bed1164