diff --git a/cmd/protoc-gen-go-tableau-checker/ast.go b/cmd/protoc-gen-go-tableau-checker/ast.go
new file mode 100644
index 0000000..f10b015
--- /dev/null
+++ b/cmd/protoc-gen-go-tableau-checker/ast.go
@@ -0,0 +1,38 @@
+package main
+
+import "go/ast"
+
+type ASTKey struct {
+	TypeName string
+	FuncName string
+}
+
+func parseAST(file *ast.File) map[ASTKey]bool {
+	astMap := map[ASTKey]bool{}
+	for _, decl := range file.Decls {
+		// check function declarations
+		fn, ok := decl.(*ast.FuncDecl)
+		if !ok || fn.Recv == nil {
+			continue
+		}
+		// check receiver typename
+		if len(fn.Recv.List) != 1 {
+			continue
+		}
+		// must be pointer receiver
+		recvType, ok := fn.Recv.List[0].Type.(*ast.StarExpr)
+		if !ok {
+			continue
+		}
+		ident, ok := recvType.X.(*ast.Ident)
+		if !ok {
+			continue
+		}
+		// mark function as exists
+		astMap[ASTKey{
+			TypeName: ident.Name,
+			FuncName: fn.Name.Name,
+		}] = true
+	}
+	return astMap
+}
diff --git a/cmd/protoc-gen-go-tableau-checker/check.go b/cmd/protoc-gen-go-tableau-checker/check.go
index 2444299..8da2f47 100644
--- a/cmd/protoc-gen-go-tableau-checker/check.go
+++ b/cmd/protoc-gen-go-tableau-checker/check.go
@@ -1,11 +1,10 @@
 package main
 
 import (
-	"bufio"
+	"go/parser"
+	"go/token"
 	"os"
 	"path/filepath"
-	"regexp"
-	"strings"
 
 	"github.com/tableauio/tableau/proto/tableaupb"
 	"google.golang.org/protobuf/compiler/protogen"
@@ -13,164 +12,93 @@ import (
 	"google.golang.org/protobuf/types/descriptorpb"
 )
 
-// const (
-// 	errorsPackage = protogen.GoImportPath("errors")
-// 	fmtPackage    = protogen.GoImportPath("fmt")
-// 	formatPackage = protogen.GoImportPath("github.com/tableauio/tableau/format")
-// 	loadPackage   = protogen.GoImportPath("github.com/tableauio/tableau/load")
-// )
-
-// golbal container for record all proto filenames and messager names
-var loaderImportPath protogen.GoImportPath
-
 // generateMessager generates a protoconf file correponsing to the protobuf file.
 // Each wrapped struct type implement the Messager interface.
-func generateMessager(gen *protogen.Plugin, file *protogen.File) {
-	loaderImportPath = protogen.GoImportPath(string(file.GoImportPath) + "/" + params.loaderPkg)
-
-	filename := filepath.Join(file.GeneratedFilenamePrefix + "." + checkExt + ".go")
-	path := filepath.Join(params.outdir, filename)
-	existed, err := Exists(path)
-	if err != nil {
-		panic(err)
-	}
-	if existed {
-		g := gen.NewGeneratedFile(filename, "")
-		generateFileHeader(gen, file, g, false)
-		addIncrementalFileContent(gen, file, g, path)
-	} else {
+func generateMessager(gen *protogen.Plugin) {
+	for _, f := range gen.Files {
+		if !NeedGenFile(f) {
+			continue
+		}
+		filename := filepath.Join(f.GeneratedFilenamePrefix + "." + checkExt + ".go")
+		path := filepath.Join(params.outdir, filename)
+		existed, err := Exists(path)
+		if err != nil {
+			panic(err)
+		}
 		g := gen.NewGeneratedFile(filename, "")
-		generateFileHeader(gen, file, g, false)
-		g.P()
-		g.P("package ", params.pkg)
-		g.P()
-		generateFileContent(gen, file, g)
+		if existed {
+			addIncrementalFileContent(f, g, path)
+		} else {
+			generateFileHeader(f, g)
+			g.P()
+			g.P("package ", params.pkg)
+			g.P("import (")
+			g.P("tableau ", loaderImportPath)
+			g.P(")")
+			g.P()
+			generateFileContent(f, g)
+		}
 	}
 }
 
-var checkerRegexp *regexp.Regexp
-
-func init() {
-	checkerRegexp = regexp.MustCompile(`^type (.+) struct {`) // e.g.: type ItemConf struct {
-}
-
-func addIncrementalFileContent(gen *protogen.Plugin, file *protogen.File, g *protogen.GeneratedFile, path string) {
-	f, err := os.Open(path)
+func addIncrementalFileContent(file *protogen.File, g *protogen.GeneratedFile, path string) {
+	content, err := os.ReadFile(path)
 	if err != nil {
 		panic(err)
 	}
-	defer f.Close()
-
-	messagerMap := map[string]bool{}
-	var fileMessagers []string
+	g.P(string(content))
+	fset := token.NewFileSet()
+	ast, err := parser.ParseFile(fset, path, content, 0)
+	if err != nil {
+		panic(err)
+	}
+	astMap := parseAST(ast)
 	for _, message := range file.Messages {
 		opts := message.Desc.Options().(*descriptorpb.MessageOptions)
 		worksheet := proto.GetExtension(opts, tableaupb.E_Worksheet).(*tableaupb.WorksheetOptions)
 		if worksheet != nil {
 			messagerName := string(message.Desc.Name())
-			messagerMap[messagerName] = false
-			fileMessagers = append(fileMessagers, messagerName)
-		}
-	}
-	content := ""
-	scanner := bufio.NewScanner(f)
-	line := 0
-	headingCommentLines := 0
-	initFirstLine := -1
-	initEndLine := -1
-	for scanner.Scan() {
-		line++
-		if headingCommentLines+1 == line && strings.HasPrefix(scanner.Text(), "//") {
-			headingCommentLines++
-		}
-		if line > headingCommentLines {
-			if strings.HasPrefix(scanner.Text(), "func init()") {
-				initFirstLine = line
-			}
-			if initFirstLine > 0 && initEndLine < 0 {
-				if strings.HasPrefix(scanner.Text(), "}") {
-					initEndLine = line
-				}
-			}
-			if initFirstLine < 0 || (initEndLine > 0 && line > initEndLine) {
-				content += scanner.Text() + "\n"
-			}
-		}
-		if matches := checkerRegexp.FindStringSubmatch(scanner.Text()); len(matches) > 0 {
-			msger := strings.TrimSpace(matches[1])
-			if _, ok := messagerMap[msger]; ok {
-				messagerMap[msger] = true
-			}
-		}
-	}
 
-	if err := scanner.Err(); err != nil {
-		panic(err)
-	}
+			if _, ok := astMap[ASTKey{
+				TypeName: messagerName,
+				FuncName: "Check",
+			}]; !ok {
+				generateCheck(g, messagerName)
+			}
 
-	g.P(content)
-	for messagerName, existed := range messagerMap {
-		if !existed {
-			genMessage(gen, file, g, messagerName, true)
+			if _, ok := astMap[ASTKey{
+				TypeName: messagerName,
+				FuncName: "CheckCompatibility",
+			}]; !ok {
+				generateCheckCompatibility(g, messagerName)
+			}
 		}
 	}
-
-	generateRegister(fileMessagers, g, true)
 }
 
 // generateFileContent generates struct type definitions.
-func generateFileContent(gen *protogen.Plugin, file *protogen.File, g *protogen.GeneratedFile) {
-	var fileMessagers []string
+func generateFileContent(file *protogen.File, g *protogen.GeneratedFile) {
 	for _, message := range file.Messages {
 		opts := message.Desc.Options().(*descriptorpb.MessageOptions)
 		worksheet := proto.GetExtension(opts, tableaupb.E_Worksheet).(*tableaupb.WorksheetOptions)
 		if worksheet != nil {
 			messagerName := string(message.Desc.Name())
-			genMessage(gen, file, g, messagerName, false)
-			fileMessagers = append(fileMessagers, messagerName)
+			generateCheck(g, messagerName)
+			generateCheckCompatibility(g, messagerName)
 		}
 	}
-	generateRegister(fileMessagers, g, false)
 }
 
-func generateRegister(messagers []string, g *protogen.GeneratedFile, incremental bool) {
-	// register messagers
-	g.P("func init() {")
-	g.P("// NOTE: This func is auto-generated. DO NOT EDIT.")
-	for _, messager := range messagers {
-		g.P("register(func() checker {")
-		g.P("return new(", messager, ")")
-		g.P("})")
-	}
-	g.P("}")
-}
-
-// genMessage generates a message definition.
-func genMessage(gen *protogen.Plugin, file *protogen.File, g *protogen.GeneratedFile, messagerName string, incremental bool) {
-	// messager definition
-	g.P("type ", messagerName, " struct {")
-	if incremental {
-		g.P(params.loaderPkg, ".", messagerName)
-	} else {
-		g.P(loaderImportPath.Ident(messagerName))
-	}
-	g.P("}")
-	g.P()
-
-	var hubTypeIdent any
-	if incremental {
-		hubTypeIdent = params.loaderPkg + ".Hub"
-	} else {
-		hubTypeIdent = loaderImportPath.Ident("Hub")
-	}
-
-	g.P("func (x *", messagerName, ") Check(hub *", hubTypeIdent, ") error {")
+func generateCheck(g *protogen.GeneratedFile, messagerName string) {
+	g.P("func (x *", messagerName, ") Check(hub *tableau.Hub) error {")
 	g.P("// TODO: implement here.")
 	g.P("return nil")
 	g.P("}")
 	g.P()
+}
 
-	g.P("func (x *", messagerName, ") CheckCompatibility(hub, newHub *", hubTypeIdent, ") error {")
+func generateCheckCompatibility(g *protogen.GeneratedFile, messagerName string) {
+	g.P("func (x *", messagerName, ") CheckCompatibility(hub, newHub *tableau.Hub) error {")
 	g.P("// TODO: implement here.")
 	g.P("return nil")
 	g.P("}")
diff --git a/cmd/protoc-gen-go-tableau-checker/helper.go b/cmd/protoc-gen-go-tableau-checker/helper.go
index b3eeffe..352bfd7 100644
--- a/cmd/protoc-gen-go-tableau-checker/helper.go
+++ b/cmd/protoc-gen-go-tableau-checker/helper.go
@@ -13,8 +13,7 @@ import (
 const checkExt = "check" // protoconf file extension
 const pbExt = "pb"       // protobuf file extension
 
-func generateFileHeader(gen *protogen.Plugin, file *protogen.File, g *protogen.GeneratedFile, doNotEdit bool) {
-	generateCommonHeader(gen, g, doNotEdit)
+func generateFileHeader(file *protogen.File, g *protogen.GeneratedFile) {
 	if file.Proto.GetOptions().GetDeprecated() {
 		g.P("// ", file.Desc.Path(), " is a deprecated file.")
 	} else {
@@ -22,11 +21,8 @@ func generateFileHeader(gen *protogen.Plugin, file *protogen.File, g *protogen.G
 	}
 }
 
-func generateCommonHeader(gen *protogen.Plugin, g *protogen.GeneratedFile, doNotEdit bool) {
-	heading := "// Code generated by protoc-gen-go-tableau-checker."
-	if doNotEdit {
-		heading += " DO NOT EDIT."
-	}
+func generateCommonHeader(gen *protogen.Plugin, g *protogen.GeneratedFile) {
+	heading := "// Code generated by protoc-gen-go-tableau-checker. DO NOT EDIT."
 	g.P(heading)
 	g.P("// versions:")
 	g.P("// - protoc-gen-go-tableau-checker v", version)
diff --git a/cmd/protoc-gen-go-tableau-checker/hub.go b/cmd/protoc-gen-go-tableau-checker/hub.go
index 473c4b5..e6e0318 100644
--- a/cmd/protoc-gen-go-tableau-checker/hub.go
+++ b/cmd/protoc-gen-go-tableau-checker/hub.go
@@ -10,7 +10,7 @@ import (
 func generateHub(gen *protogen.Plugin) {
 	filename := filepath.Join("hub." + checkExt + ".go")
 	g := gen.NewGeneratedFile(filename, "")
-	generateCommonHeader(gen, g, true)
+	generateCommonHeader(gen, g)
 	g.P()
 	g.P("package ", params.pkg)
 	g.P("import (")
diff --git a/cmd/protoc-gen-go-tableau-checker/main.go b/cmd/protoc-gen-go-tableau-checker/main.go
index af4c549..9b8ce60 100644
--- a/cmd/protoc-gen-go-tableau-checker/main.go
+++ b/cmd/protoc-gen-go-tableau-checker/main.go
@@ -17,6 +17,8 @@ type Params struct {
 
 var params = Params{}
 
+var loaderImportPath protogen.GoImportPath
+
 func main() {
 	var flags flag.FlagSet
 	flags.StringVar(&params.pkg, "pkg", "check", "tableau checker package name")
@@ -32,8 +34,11 @@ func main() {
 			if !NeedGenFile(f) {
 				continue
 			}
-			generateMessager(gen, f)
+			loaderImportPath = protogen.GoImportPath(string(f.GoImportPath) + "/" + params.loaderPkg)
+			break
 		}
+		generateTypes(gen)
+		generateMessager(gen)
 		generateHub(gen)
 		return nil
 	})
diff --git a/cmd/protoc-gen-go-tableau-checker/types.go b/cmd/protoc-gen-go-tableau-checker/types.go
new file mode 100644
index 0000000..33f73c4
--- /dev/null
+++ b/cmd/protoc-gen-go-tableau-checker/types.go
@@ -0,0 +1,50 @@
+package main
+
+import (
+	"path/filepath"
+
+	"github.com/tableauio/tableau/proto/tableaupb"
+	"google.golang.org/protobuf/compiler/protogen"
+	"google.golang.org/protobuf/proto"
+	"google.golang.org/protobuf/types/descriptorpb"
+)
+
+// generateTypes generates related types files.
+func generateTypes(gen *protogen.Plugin) {
+	filename := filepath.Join("types." + checkExt + ".go")
+	g := gen.NewGeneratedFile(filename, "")
+	generateCommonHeader(gen, g)
+	g.P()
+	g.P("package ", params.pkg)
+	var messages []*protogen.Message
+	for _, f := range gen.Files {
+		if !NeedGenFile(f) {
+			continue
+		}
+		for _, message := range f.Messages {
+			opts := message.Desc.Options().(*descriptorpb.MessageOptions)
+			worksheet := proto.GetExtension(opts, tableaupb.E_Worksheet).(*tableaupb.WorksheetOptions)
+			if worksheet != nil {
+				messages = append(messages, message)
+			}
+		}
+	}
+	for _, message := range messages {
+		messagerName := string(message.Desc.Name())
+		g.P()
+		// messager definition
+		g.P("type ", messagerName, " struct {")
+		g.P(loaderImportPath.Ident(messagerName))
+		g.P("}")
+	}
+	g.P()
+	// register messagers
+	g.P("func init() {")
+	for _, message := range messages {
+		messagerName := string(message.Desc.Name())
+		g.P("register(func() checker {")
+		g.P("return new(", messagerName, ")")
+		g.P("})")
+	}
+	g.P("}")
+}
diff --git a/test/check/test_conf.check.go b/test/check/test_conf.check.go
index b621888..ea86240 100644
--- a/test/check/test_conf.check.go
+++ b/test/check/test_conf.check.go
@@ -1,7 +1,3 @@
-// Code generated by protoc-gen-go-tableau-checker.
-// versions:
-// - protoc-gen-go-tableau-checker v0.6.2
-// - protoc                        v3.19.3
 // source: test_conf.proto
 
 package check
@@ -12,10 +8,6 @@ import (
 	tableau "github.com/tableauio/checker/test/protoconf/tableau"
 )
 
-type ActivityConf struct {
-	tableau.ActivityConf
-}
-
 func (x *ActivityConf) Check(hub *tableau.Hub) error {
 	// TODO: implement here.
 	return nil
@@ -26,10 +18,6 @@ func (x *ActivityConf) CheckCompatibility(hub, newHub *tableau.Hub) error {
 		hub.GetItemConf().Data(), newHub.GetItemConf().Data())
 }
 
-type ChapterConf struct {
-	tableau.ChapterConf
-}
-
 func (x *ChapterConf) Check(hub *tableau.Hub) error {
 	// TODO: implement here.
 	return nil
@@ -39,10 +27,6 @@ func (x *ChapterConf) CheckCompatibility(hub, newHub *tableau.Hub) error {
 	return fmt.Errorf("should not reach here since ChapterConf is not successfully loaded")
 }
 
-type ThemeConf struct {
-	tableau.ThemeConf
-}
-
 func (x *ThemeConf) Check(hub *tableau.Hub) error {
 	// TODO: implement here.
 	return nil
@@ -51,16 +35,3 @@ func (x *ThemeConf) Check(hub *tableau.Hub) error {
 func (x *ThemeConf) CheckCompatibility(hub, newHub *tableau.Hub) error {
 	return fmt.Errorf("should not reach here since ThemeConf is not successfully loaded")
 }
-
-func init() {
-	// NOTE: This func is auto-generated. DO NOT EDIT.
-	register(func() checker {
-		return new(ActivityConf)
-	})
-	register(func() checker {
-		return new(ChapterConf)
-	})
-	register(func() checker {
-		return new(ThemeConf)
-	})
-}
diff --git a/test/check/types.check.go b/test/check/types.check.go
new file mode 100644
index 0000000..93ef7c8
--- /dev/null
+++ b/test/check/types.check.go
@@ -0,0 +1,35 @@
+// Code generated by protoc-gen-go-tableau-checker. DO NOT EDIT.
+// versions:
+// - protoc-gen-go-tableau-checker v0.6.2
+// - protoc                        v3.19.3
+
+package check
+
+import (
+	tableau "github.com/tableauio/checker/test/protoconf/tableau"
+)
+
+type ActivityConf struct {
+	tableau.ActivityConf
+}
+
+type ChapterConf struct {
+	tableau.ChapterConf
+}
+
+type ThemeConf struct {
+	tableau.ThemeConf
+}
+
+func init() {
+	// NOTE: This func is auto-generated. DO NOT EDIT.
+	register(func() checker {
+		return new(ActivityConf)
+	})
+	register(func() checker {
+		return new(ChapterConf)
+	})
+	register(func() checker {
+		return new(ThemeConf)
+	})
+}