diff --git a/server/im_http.go b/server/im_http.go
index f2aa80c..a38360a 100644
--- a/server/im_http.go
+++ b/server/im_http.go
@@ -5619,6 +5619,11 @@ func serveIMGroupInvitations(wrt http.ResponseWriter, req *http.Request, topic s
 			}
 			if joined {
 				item["status"] = types.GroupInvitationStatusJoined
+				if imReliableHTTPEventsEnabled(req) {
+					publishIMGroupMemberJoinedSystemNotice(principal.TenantID, topic, principal.Uid, uid,
+						"有成员通过邀请加入了群聊。",
+						map[string]any{"source": "direct_invitation"})
+				}
 			} else {
 				item["status"] = "already_member"
 			}
@@ -5863,6 +5868,11 @@ func serveIMGroupJoinRequests(wrt http.ResponseWriter, req *http.Request, topic
 			}
 			publishIMGroupRealtimeEvent(principal.TenantID, topic, principal.Uid, "group.member.joined",
 				map[string]any{"user_id": principal.Uid.UserId(), "joined": joined, "source": "open_group"})
+			if joined && imReliableHTTPEventsEnabled(req) {
+				publishIMGroupMemberJoinedSystemNotice(principal.TenantID, topic, principal.Uid, principal.Uid,
+					"有成员加入了群聊。",
+					map[string]any{"source": "open_group"})
+			}
 			writeIMSuccess(wrt, req, map[string]any{"topic": topic, "status": "joined", "joined": joined, "source": "open_group"})
 			return
 		}
@@ -11652,6 +11662,28 @@ func publishIMGroupInvitationNotification(tenantID types.TenantID, inv *types.Gr
 	}
 }
 
+func publishIMGroupMemberJoinedSystemNotice(tenantID types.TenantID, topic string, inviter, target types.Uid, text string, extra map[string]any) {
+	if target.IsZero() {
+		return
+	}
+	actors := make([]imSystemMessageActor, 0, 2)
+	if !inviter.IsZero() && inviter != target {
+		actors = append(actors, imSystemMessageActor{
+			UserID: inviter.UserId(),
+			Click:  map[string]any{"type": "user_profile", "target_id": inviter.UserId()},
+		})
+	}
+	actors = append(actors, imSystemMessageActor{
+		UserID: target.UserId(),
+		Click:  map[string]any{"type": "user_profile", "target_id": target.UserId()},
+	})
+	publishIMConversationSystemNotice(tenantID, topic,
+		"system_action", "group_member_joined", text,
+		actors,
+		[]imSystemMessageAction{{Type: "group_profile", Label: "查看群聊", TargetID: topic}},
+		extra)
+}
+
 func deliverIMConversationSystemMessageToP2PSessions(tenantID types.TenantID, msg *types.Message, out *ServerComMessage) {
 	if globals.sessionStore == nil || msg == nil || out == nil || out.Data == nil {
 		return
diff --git a/server/im_http_test.go b/server/im_http_test.go
index 76c2f24..2ef0703 100644
--- a/server/im_http_test.go
+++ b/server/im_http_test.go
@@ -5379,6 +5379,74 @@ func TestServeIMGroupQRCodesAndResolve(t *testing.T) {
 	}
 }
 
+func TestServeIMGroupInvitationDirectJoinWritesSystemNotice(t *testing.T) {
+	ctrl := gomock.NewController(t)
+	defer ctrl.Finish()
+	mockStore := expectIMBearer(t, ctrl, "token-1", 7, 42)
+	mockStore.EXPECT().IsOpen().Return(true).AnyTimes()
+
+	oldSubs := store.Subs
+	oldTopics := store.Topics
+	oldMessages := store.Messages
+	oldProfiles := store.Profiles
+	oldGroupBusiness := store.GroupBusiness
+	subs := mock_store.NewMockSubsPersistenceInterface(ctrl)
+	topics := mock_store.NewMockTopicsPersistenceInterface(ctrl)
+	messages := mock_store.NewMockMessagesPersistenceInterface(ctrl)
+	store.Subs = subs
+	store.Topics = topics
+	store.Messages = messages
+	store.Profiles = nil
+	store.GroupBusiness = &testGroupBusinessStore{}
+	t.Cleanup(func() {
+		store.Subs = oldSubs
+		store.Topics = oldTopics
+		store.Messages = oldMessages
+		store.Profiles = oldProfiles
+		store.GroupBusiness = oldGroupBusiness
+	})
+
+	subs.EXPECT().Get(types.TenantID(7), "grpAlpha", types.Uid(42), false).Return(&types.Subscription{
+		TenantID: 7, User: types.Uid(42).String(), Topic: "grpAlpha", ModeWant: types.ModeCFull, ModeGiven: types.ModeCFull,
+	}, nil)
+	subs.EXPECT().Get(types.TenantID(7), "grpAlpha", types.Uid(43), false).Return(nil, types.ErrNotFound)
+	topics.EXPECT().Get(types.TenantID(7), "grpAlpha").Return(&types.Topic{TenantID: 7, SeqId: 7}, nil)
+	messages.EXPECT().Save(types.TenantID(7), gomock.Any(), nil, false).DoAndReturn(
+		func(_ types.TenantID, msg *types.Message, _ []string, _ bool) (*types.MessageSaveResult, error) {
+			if msg.Topic != "grpAlpha" || msg.SeqId != 8 {
+				t.Fatalf("unexpected system notice message: %#v", msg)
+			}
+			if msg.Head["x-im-template"] != "group_member_joined" || msg.Head["x-im-type"] != "system_action" {
+				t.Fatalf("unexpected system notice head: %#v", msg.Head)
+			}
+			content := msg.Content.(map[string]any)
+			if content["text"] != "有成员通过邀请加入了群聊。" || content["template"] != "group_member_joined" {
+				t.Fatalf("unexpected system notice content: %#v", content)
+			}
+			extra := content["extra"].(map[string]any)
+			if extra["source"] != "direct_invitation" {
+				t.Fatalf("unexpected system notice extra: %#v", extra)
+			}
+			return &types.MessageSaveResult{SeqId: msg.SeqId}, nil
+		})
+
+	body := fmt.Sprintf(`{"user_ids":["%s"],"message":"欢迎"}`, types.Uid(43).UserId())
+	req := httptest.NewRequest(http.MethodPost, "/v1/im/groups/grpAlpha/invitations", strings.NewReader(body))
+	req.Header.Set("Authorization", "Bearer token-1")
+	req.Header.Set("Idempotency-Key", "invite-1")
+	req = req.WithContext(context.WithValue(req.Context(), imHTTPProtocolValidated, true))
+	rec := httptest.NewRecorder()
+	serveIMGroupResource(rec, req)
+	if rec.Code != http.StatusOK {
+		t.Fatalf("invite status: got %d body=%s", rec.Code, rec.Body.String())
+	}
+	data := decodeIMHTTPResponse(t, rec).Data.(map[string]any)
+	items := data["items"].([]any)
+	if len(items) != 1 || items[0].(map[string]any)["status"] != types.GroupInvitationStatusJoined {
+		t.Fatalf("unexpected invitation response: %#v", data)
+	}
+}
+
 func TestServeIMGroupAnnouncementGovernanceJoinRequest(t *testing.T) {
 	ctrl := gomock.NewController(t)
 	defer ctrl.Finish()