diff --git a/model/notification_group.go b/model/notification_group.go
new file mode 100644
index 0000000..5244a01
--- /dev/null
+++ b/model/notification_group.go
@@ -0,0 +1,6 @@
+package model
+
+type NotificationGroup struct {
+	Common
+	Name string `json:"name"`
+}
diff --git a/model/notification_group_notification.go b/model/notification_group_notification.go
new file mode 100644
index 0000000..63e20c2
--- /dev/null
+++ b/model/notification_group_notification.go
@@ -0,0 +1,7 @@
+package model
+
+type NotificationGroupNotification struct {
+	Common
+	NotificationGroupID uint64 `json:"notification_group_id"`
+	NotificationID      uint64 `json:"notification_id"`
+}
diff --git a/model/server.go b/model/server.go
index e0a923b..2427ae3 100644
--- a/model/server.go
+++ b/model/server.go
@@ -7,9 +7,10 @@ import (
 	"sync"
 	"time"
 
+	"gorm.io/gorm"
+
 	"github.com/naiba/nezha/pkg/utils"
 	pb "github.com/naiba/nezha/proto"
-	"gorm.io/gorm"
 )
 
 type Server struct {
diff --git a/model/server_group.go b/model/server_group.go
new file mode 100644
index 0000000..db558e9
--- /dev/null
+++ b/model/server_group.go
@@ -0,0 +1,6 @@
+package model
+
+type ServerGroup struct {
+	Common
+	Name string `json:"name"`
+}
diff --git a/model/server_group_server.go b/model/server_group_server.go
new file mode 100644
index 0000000..2786431
--- /dev/null
+++ b/model/server_group_server.go
@@ -0,0 +1,7 @@
+package model
+
+type ServerGroupServer struct {
+	Common
+	ServerGroupId uint64 `json:"server_group_id"`
+	ServerId      uint64 `json:"server_id"`
+}
diff --git a/model/user_group.go b/model/user_group.go
new file mode 100644
index 0000000..45b0ecf
--- /dev/null
+++ b/model/user_group.go
@@ -0,0 +1,6 @@
+package model
+
+type UserGroup struct {
+	Common
+	Name string `json:"name"`
+}
diff --git a/model/user_group_user.go b/model/user_group_user.go
new file mode 100644
index 0000000..080f35e
--- /dev/null
+++ b/model/user_group_user.go
@@ -0,0 +1,7 @@
+package model
+
+type UserGroupUser struct {
+	Common
+	UserGroupId uint64 `json:"user_group_id"`
+	UserId      uint64 `json:"user_id"`
+}