diff --git a/common/pkgs/mq/scanner/event/agent_check_cache.go b/common/pkgs/mq/scanner/event/agent_check_cache.go
index 08b241a..4cdaec2 100644
--- a/common/pkgs/mq/scanner/event/agent_check_cache.go
+++ b/common/pkgs/mq/scanner/event/agent_check_cache.go
@@ -1,7 +1,5 @@
 package event
 
-var _ = Register[*AgentCheckCache]()
-
 type AgentCheckCache struct {
 	EventBase
 	NodeID     int64    `json:"nodeID"`
@@ -14,3 +12,7 @@ func NewAgentCheckCache(nodeID int64, fileHashes []string) *AgentCheckCache {
 		FileHashes: fileHashes,
 	}
 }
+
+func init() {
+	Register[*AgentCheckCache]()
+}
diff --git a/common/pkgs/mq/scanner/event/agent_check_state.go b/common/pkgs/mq/scanner/event/agent_check_state.go
index 54b9741..91d34be 100644
--- a/common/pkgs/mq/scanner/event/agent_check_state.go
+++ b/common/pkgs/mq/scanner/event/agent_check_state.go
@@ -1,7 +1,5 @@
 package event
 
-var _ = Register[*AgentCheckState]()
-
 type AgentCheckState struct {
 	EventBase
 	NodeID int64 `json:"nodeID"`
@@ -12,3 +10,7 @@ func NewAgentCheckState(nodeID int64) *AgentCheckState {
 		NodeID: nodeID,
 	}
 }
+
+func init() {
+	Register[*AgentCheckState]()
+}
diff --git a/common/pkgs/mq/scanner/event/agent_check_storage.go b/common/pkgs/mq/scanner/event/agent_check_storage.go
index 3c971f2..aeaffa1 100644
--- a/common/pkgs/mq/scanner/event/agent_check_storage.go
+++ b/common/pkgs/mq/scanner/event/agent_check_storage.go
@@ -1,7 +1,5 @@
 package event
 
-var _ = Register[*AgentCheckStorage]()
-
 type AgentCheckStorage struct {
 	EventBase
 	StorageID  int64   `json:"storageID"`
@@ -14,3 +12,7 @@ func NewAgentCheckStorage(storageID int64, packageIDs []int64) *AgentCheckStorag
 		PackageIDs: packageIDs,
 	}
 }
+
+func init() {
+	Register[*AgentCheckStorage]()
+}
diff --git a/common/pkgs/mq/scanner/event/check_cache.go b/common/pkgs/mq/scanner/event/check_cache.go
index 3325a0b..d6f7633 100644
--- a/common/pkgs/mq/scanner/event/check_cache.go
+++ b/common/pkgs/mq/scanner/event/check_cache.go
@@ -1,7 +1,5 @@
 package event
 
-var _ = Register[*CheckCache]()
-
 type CheckCache struct {
 	EventBase
 	NodeID int64 `json:"nodeID"`
@@ -12,3 +10,7 @@ func NewCheckCache(nodeID int64) *CheckCache {
 		NodeID: nodeID,
 	}
 }
+
+func init() {
+	Register[*CheckCache]()
+}
diff --git a/common/pkgs/mq/scanner/event/check_package.go b/common/pkgs/mq/scanner/event/check_package.go
index 526dda0..50fb664 100644
--- a/common/pkgs/mq/scanner/event/check_package.go
+++ b/common/pkgs/mq/scanner/event/check_package.go
@@ -1,7 +1,5 @@
 package event
 
-var _ = Register[*CheckPackage]()
-
 type CheckPackage struct {
 	EventBase
 	PackageIDs []int64 `json:"packageIDs"`
@@ -12,3 +10,7 @@ func NewCheckPackage(packageIDs []int64) *CheckPackage {
 		PackageIDs: packageIDs,
 	}
 }
+
+func init() {
+	Register[*CheckPackage]()
+}
diff --git a/common/pkgs/mq/scanner/event/check_rep_count.go b/common/pkgs/mq/scanner/event/check_rep_count.go
index 39f2c74..3fe055b 100644
--- a/common/pkgs/mq/scanner/event/check_rep_count.go
+++ b/common/pkgs/mq/scanner/event/check_rep_count.go
@@ -1,7 +1,5 @@
 package event
 
-var _ = Register[*CheckRepCount]()
-
 type CheckRepCount struct {
 	EventBase
 	FileHashes []string `json:"fileHashes"`
@@ -12,3 +10,7 @@ func NewCheckRepCount(fileHashes []string) *CheckRepCount {
 		FileHashes: fileHashes,
 	}
 }
+
+func init() {
+	Register[*CheckRepCount]()
+}
diff --git a/common/pkgs/mq/scanner/event/event.go b/common/pkgs/mq/scanner/event/event.go
index 8fc6578..e1f1488 100644
--- a/common/pkgs/mq/scanner/event/event.go
+++ b/common/pkgs/mq/scanner/event/event.go
@@ -1,28 +1,23 @@
 package event
 
 import (
-	"gitlink.org.cn/cloudream/common/pkgs/mq"
 	"gitlink.org.cn/cloudream/common/pkgs/types"
 	myreflect "gitlink.org.cn/cloudream/common/utils/reflect"
+	"gitlink.org.cn/cloudream/common/utils/serder"
 )
 
 type Event interface {
 	Noop()
 }
 
-var EventTypeUnino = types.NewTypeUnion[Event]()
+var EventTypeUnino = serder.UseTypeUnionExternallyTagged(types.Ref(types.NewTypeUnion[Event]()))
 
 type EventBase struct{}
 
 func (e *EventBase) Noop() {}
 
-// 注：此函数必须以var _ = Register[xxx]()的形式被调用，这样才能保证init中RegisterUnionType时
-// TypeUnion不是空的。（因为包级变量初始化比init函数调用先进行）
+// 只能在init函数中调用，因为包级变量初始化比init函数调用先进行
 func Register[T Event]() any {
 	EventTypeUnino.Add(myreflect.TypeOf[T]())
 	return nil
 }
-
-func init() {
-	mq.RegisterUnionType(EventTypeUnino)
-}