diff --git a/tool/cmd/kitex/args/args.go b/tool/cmd/kitex/args/args.go
index b609dd3249..9a0aa7c3c3 100644
--- a/tool/cmd/kitex/args/args.go
+++ b/tool/cmd/kitex/args/args.go
@@ -29,7 +29,6 @@ import (
 	"strings"
 	"time"
 
-	"github.com/cloudwego/kitex/pkg/klog"
 	"github.com/cloudwego/kitex/tool/internal_pkg/generator"
 	"github.com/cloudwego/kitex/tool/internal_pkg/log"
 	"github.com/cloudwego/kitex/tool/internal_pkg/pluginmode/protoc"
@@ -306,7 +305,7 @@ func (a *Arguments) checkPath(curpath string) error {
 
 	goMod, goModPath, hasGoMod := util.SearchGoMod(curpath)
 	if usingGOPATH && a.ModuleName == "" && !hasGoMod {
-		log.Warn("[Warn] You're relying on $GOPATH for generating code.\n" +
+		log.Warn("You're relying on $GOPATH for generating code.\n" +
 			"Please add go.mod or specify -module for module path.\n" +
 			"We will deprecate $GOPATH support in the near future!")
 	}
@@ -370,7 +369,8 @@ func (a *Arguments) BuildCmd(out io.Writer) (*exec.Cmd, error) {
 		}
 	}
 
-	kas := strings.Join(a.Config.Pack(), ",")
+	configkv := a.Config.Pack()
+	kas := strings.Join(configkv, ",")
 	cmd := &exec.Cmd{
 		Path:   LookupTool(a.IDLType, a.CompilerPath),
 		Stdin:  os.Stdin,
@@ -453,7 +453,8 @@ func (a *Arguments) BuildCmd(out io.Writer) (*exec.Cmd, error) {
 
 		cmd.Args = append(cmd.Args, a.IDL)
 	}
-	log.Info(strings.ReplaceAll(strings.Join(cmd.Args, " "), kas, fmt.Sprintf("%q", kas)))
+	log.Debugf("cmd.Args %v", cmd.Args)
+	log.Debugf("config pairs %v", configkv)
 	return cmd, nil
 }
 
@@ -525,11 +526,11 @@ func versionSatisfied(current, required string) bool {
 		var currentSeg, minimalSeg int
 		var err error
 		if currentSeg, err = strconv.Atoi(currentSegments[i]); err != nil {
-			klog.Warnf("invalid current version: %s, seg=%v, err=%v", current, currentSegments[i], err)
+			log.Warnf("invalid current version: %s, seg=%v, err=%v", current, currentSegments[i], err)
 			return false
 		}
 		if minimalSeg, err = strconv.Atoi(requiredSegments[i]); err != nil {
-			klog.Warnf("invalid required version: %s, seg=%v, err=%v", required, requiredSegments[i], err)
+			log.Warnf("invalid required version: %s, seg=%v, err=%v", required, requiredSegments[i], err)
 			return false
 		}
 		if currentSeg > minimalSeg {
@@ -551,7 +552,7 @@ func LookupTool(idlType, compilerPath string) string {
 		tool = "protoc"
 	}
 	if compilerPath != "" {
-		log.Infof("Will use the specified %s: %s\n", tool, compilerPath)
+		log.Debugf("Will use the specified %s: %s\n", tool, compilerPath)
 		return compilerPath
 	}
 
diff --git a/tool/cmd/kitex/main.go b/tool/cmd/kitex/main.go
index a1530837c7..de4dcf0c44 100644
--- a/tool/cmd/kitex/main.go
+++ b/tool/cmd/kitex/main.go
@@ -16,6 +16,7 @@ package main
 
 import (
 	"bytes"
+	"errors"
 	"flag"
 	"os"
 	"path/filepath"
@@ -56,7 +57,7 @@ func init() {
 			Version: "v0.11.0",
 		},
 	); err != nil {
-		log.Warn(err)
+		log.Error(err)
 		os.Exit(versions.CompatibilityCheckExitCode)
 	}
 }
@@ -75,17 +76,17 @@ func main() {
 
 	curpath, err := filepath.Abs(".")
 	if err != nil {
-		log.Warn("Get current path failed:", err.Error())
+		log.Errorf("Get current path failed: %s", err)
 		os.Exit(1)
 	}
 	// run as kitex
 	err = args.ParseArgs(kitex.Version, curpath, os.Args[1:])
 	if err != nil {
-		if err.Error() != "flag: help requested" {
-			log.Warn(err.Error())
-			os.Exit(2)
+		if errors.Is(err, flag.ErrHelp) {
+			os.Exit(0)
 		}
-		os.Exit(0)
+		log.Error(err)
+		os.Exit(2)
 	}
 	if !args.NoDependencyCheck {
 		// check dependency compatibility between kitex cmd tool and dependency in go.mod
diff --git a/tool/cmd/kitex/sdk/kitex_sdk.go b/tool/cmd/kitex/sdk/kitex_sdk.go
index 1cd6e3d445..4411a06aab 100644
--- a/tool/cmd/kitex/sdk/kitex_sdk.go
+++ b/tool/cmd/kitex/sdk/kitex_sdk.go
@@ -16,6 +16,7 @@ package sdk
 
 import (
 	"bytes"
+	"errors"
 	"flag"
 	"fmt"
 	"os/exec"
@@ -33,7 +34,7 @@ import (
 
 var args kargs.Arguments
 
-var errExitZero = fmt.Errorf("os.Exit(0)")
+var errExitZero = errors.New("os.Exit(0)")
 
 func init() {
 	var queryVersion bool
@@ -55,7 +56,7 @@ func init() {
 func RunKitexTool(wd string, plugins []plugin.SDKPlugin, kitexArgs ...string) error {
 	kitexPlugin, err := GetKiteXSDKPlugin(wd, kitexArgs)
 	if err != nil {
-		if err.Error() == "flag: help requested" || err == errExitZero {
+		if errors.Is(err, flag.ErrHelp) || errors.Is(err, errExitZero) {
 			return nil
 		}
 		return err
@@ -101,16 +102,11 @@ func InvokeThriftgoBySDK(pwd string, cmd *exec.Cmd) (err error) {
 
 	kitexPlugin.Pwd = pwd
 
-	s := []plugin.SDKPlugin{kitexPlugin}
-
-	err = sdk.RunThriftgoAsSDK(pwd, s, kitexPlugin.GetThriftgoParameters()...)
-	// when execute thriftgo as function, log will be unexpectedly replaced (for old code by design), so we have to change it back.
-	log.SetDefaultLogger(log.Logger{
-		Println: fmt.Fprintln,
-		Printf:  fmt.Fprintf,
-	})
-
-	return err
+	l := log.DefaultLogger()      // pluginmode/thriftgo/convertor.go will change the logger
+	defer log.SetDefaultLogger(l) // revert it back
+	return sdk.RunThriftgoAsSDK(pwd,
+		[]plugin.SDKPlugin{kitexPlugin},
+		kitexPlugin.GetThriftgoParameters()...)
 }
 
 type KiteXSDKPlugin struct {
diff --git a/tool/cmd/kitex/utils/utils.go b/tool/cmd/kitex/utils/utils.go
index 3b257d462e..f24378aefc 100644
--- a/tool/cmd/kitex/utils/utils.go
+++ b/tool/cmd/kitex/utils/utils.go
@@ -24,7 +24,7 @@ import (
 )
 
 func OnKitexToolNormalExit(args kargs.Arguments) {
-	log.Warn("Code Generation is Done!")
+	log.Info("Code Generation is Done!")
 
 	if args.IDLType == "thrift" {
 		cmd := "go mod edit -replace github.com/apache/thrift=github.com/apache/thrift@v0.13.0"
diff --git a/tool/cmd/kitex/versions/dependencies.go b/tool/cmd/kitex/versions/dependencies.go
index c552b83dd5..2113d1c81a 100644
--- a/tool/cmd/kitex/versions/dependencies.go
+++ b/tool/cmd/kitex/versions/dependencies.go
@@ -78,7 +78,7 @@ func DefaultCheckDependencyAndProcess() error {
 	}
 	res, shouldExit := defaultParseCheckResult(cr)
 	if res != "" {
-		log.Warn(res)
+		log.Info(res)
 	}
 	if shouldExit {
 		return errors.New("kitex cmd tool dependency compatibility check failed")
diff --git a/tool/internal_pkg/generator/completor.go b/tool/internal_pkg/generator/completor.go
index 154b7caac0..03d07814c3 100644
--- a/tool/internal_pkg/generator/completor.go
+++ b/tool/internal_pkg/generator/completor.go
@@ -83,7 +83,7 @@ func (c *completer) compare(pkg *ast.Package) []*MethodInfo {
 			}
 		}
 		if !have {
-			log.Infof("[complete handler] add '%s' to handler.go\n", m.Name)
+			log.Debugf("[complete handler] add '%s' to handler.go\n", m.Name)
 			newMethods = append(newMethods, m)
 		}
 	}
@@ -159,8 +159,10 @@ func (c *completer) process(w io.Writer) error {
 	fset := token.NewFileSet()
 	pkgs, err := parser.ParseDir(fset, filepath.Dir(c.handlerPath), nil, parser.ParseComments)
 	if err != nil {
-		err = fmt.Errorf("go/parser failed to parse the main package: %w", err)
-		log.Warn("NOTICE: This is not a bug. We cannot add new methods to handler.go because your codes failed to compile. Fix the compile errors and try again.\n%s", err.Error())
+		log.Warnf("This is not a bug. \n"+
+			"We cannot add new methods to handler.go because your codes failed to compile. \n"+
+			"Fix the compile errors and try again.\n"+
+			"go/parser err: %s", err)
 		return err
 	}
 	main, ok := pkgs["main"]
diff --git a/tool/internal_pkg/generator/custom_template.go b/tool/internal_pkg/generator/custom_template.go
index 3f364589db..4b790e6192 100644
--- a/tool/internal_pkg/generator/custom_template.go
+++ b/tool/internal_pkg/generator/custom_template.go
@@ -129,7 +129,7 @@ func (c *customGenerator) commonGenerate(tpl *Template) error {
 	filePath := filepath.Join(c.basePath, renderPath)
 	update := util.Exists(filePath)
 	if update && updateType(tpl.UpdateBehavior.Type) == skip {
-		log.Infof("skip generate file %s", tpl.Path)
+		log.Debugf("skip generate file %s", tpl.Path)
 		return nil
 	}
 	var f *File
diff --git a/tool/internal_pkg/generator/generator.go b/tool/internal_pkg/generator/generator.go
index 885b1f8945..d150ca7bec 100644
--- a/tool/internal_pkg/generator/generator.go
+++ b/tool/internal_pkg/generator/generator.go
@@ -377,7 +377,7 @@ func (g *generator) GenerateMainPackage(pkg *PackageInfo) (fs []*File, err error
 	}
 	for _, t := range tasks {
 		if util.Exists(t.Path) {
-			log.Info(t.Path, "exists. Skipped.")
+			log.Debug(t.Path, "exists. Skipped.")
 			continue
 		}
 		g.setImports(t.Name, pkg)
diff --git a/tool/internal_pkg/log/log.go b/tool/internal_pkg/log/log.go
index 699e8dd66b..106d5bbb9d 100644
--- a/tool/internal_pkg/log/log.go
+++ b/tool/internal_pkg/log/log.go
@@ -16,7 +16,7 @@ package log
 
 import (
 	"fmt"
-	"io"
+	"log"
 	"os"
 )
 
@@ -24,14 +24,23 @@ import (
 var Verbose bool
 
 // Logger .
-type Logger struct {
-	Println func(w io.Writer, a ...interface{}) (n int, err error)
-	Printf  func(w io.Writer, format string, a ...interface{}) (n int, err error)
+type Logger interface {
+	Printf(format string, a ...interface{})
 }
 
-var defaultLogger = Logger{
-	Println: fmt.Fprintln,
-	Printf:  fmt.Fprintf,
+// LoggerFunc implements Logger
+type LoggerFunc func(format string, a ...interface{})
+
+func (f LoggerFunc) Printf(format string, a ...interface{}) {
+	f(format, a...)
+}
+
+// must use os.Stderr, os.Stdout is used by plugin for output
+var defaultLogger Logger = log.New(os.Stderr, "", 0)
+
+// DefaultLogger ...
+func DefaultLogger() Logger {
+	return defaultLogger
 }
 
 // SetDefaultLogger sets the default logger.
@@ -39,26 +48,48 @@ func SetDefaultLogger(l Logger) {
 	defaultLogger = l
 }
 
-// Warn .
+// Error ...
+func Error(v ...interface{}) {
+	defaultLogger.Printf("[ERROR] %s", fmt.Sprintln(v...))
+}
+
+// Errorf ...
+func Errorf(format string, v ...interface{}) {
+	defaultLogger.Printf("[ERROR] "+format, v...)
+}
+
+// Warn ...
 func Warn(v ...interface{}) {
-	defaultLogger.Println(os.Stderr, v...)
+	defaultLogger.Printf("[WARN] %s", fmt.Sprintln(v...))
 }
 
-// Warnf .
+// Warnf ...
 func Warnf(format string, v ...interface{}) {
-	defaultLogger.Printf(os.Stderr, format, v...)
+	defaultLogger.Printf("[WARN] "+format, v...)
 }
 
-// Info .
+// Info ...
 func Info(v ...interface{}) {
-	if Verbose {
-		defaultLogger.Println(os.Stderr, v...)
-	}
+	defaultLogger.Printf("[INFO] %s", fmt.Sprintln(v...))
 }
 
-// Infof .
+// Infof ...
 func Infof(format string, v ...interface{}) {
-	if Verbose {
-		defaultLogger.Printf(os.Stderr, format, v...)
+	defaultLogger.Printf("[INFO] "+format, v...)
+}
+
+// Debug ...
+func Debug(v ...interface{}) {
+	if !Verbose {
+		return
+	}
+	defaultLogger.Printf("[DEBUG] %s", fmt.Sprintln(v...))
+}
+
+// Debugf ...
+func Debugf(format string, v ...interface{}) {
+	if !Verbose {
+		return
 	}
+	defaultLogger.Printf("[DEBUG] "+format, v...)
 }
diff --git a/tool/internal_pkg/pluginmode/protoc/plugin.go b/tool/internal_pkg/pluginmode/protoc/plugin.go
index a7fb50fc3f..71700645ce 100644
--- a/tool/internal_pkg/pluginmode/protoc/plugin.go
+++ b/tool/internal_pkg/pluginmode/protoc/plugin.go
@@ -122,11 +122,12 @@ func (pp *protocPlugin) GenerateFile(gen *protogen.Plugin, file *protogen.File)
 	}
 	gopkg := file.Proto.GetOptions().GetGoPackage()
 	if !strings.HasPrefix(gopkg, pp.PackagePrefix) {
-		log.Warnf("[WARN] %q is skipped because its import path %q is not located in ./kitex_gen. Change the go_package option or use '--protobuf M%s=A-Import-Path-In-kitex_gen' to override it if you want this file to be generated under kitex_gen.\n",
+		log.Warnf("%q is skipped because its import path %q is not located in ./kitex_gen.\n"+
+			"Change the go_package option or use '--protobuf M%s=A-Import-Path-In-kitex_gen' to override it if you want this file to be generated under kitex_gen.\n",
 			file.Proto.GetName(), gopkg, file.Proto.GetName())
 		return
 	}
-	log.Infof("[INFO] Generate %q at %q\n", file.Proto.GetName(), gopkg)
+	log.Debugf("Generate %q at %q\n", file.Proto.GetName(), gopkg)
 
 	if parts := strings.Split(gopkg, ";"); len(parts) > 1 {
 		gopkg = parts[0] // remove package alias from file path
@@ -320,7 +321,7 @@ func (pp *protocPlugin) convertTypes(file *protogen.File) (ss []*generator.Servi
 		mm := make(map[string]*generator.MethodInfo)
 		for _, m := range methods {
 			if _, ok := mm[m.Name]; ok {
-				log.Warnf("[WARN] combine service method %s in %s conflicts with %s in %s\n",
+				log.Warnf("combine service method %s in %s conflicts with %s in %s\n",
 					m.Name, m.ServiceName, m.Name, mm[m.Name].ServiceName)
 				return
 			}
diff --git a/tool/internal_pkg/pluginmode/protoc/protoc.go b/tool/internal_pkg/pluginmode/protoc/protoc.go
index 28c53c4588..8a3e7c6e05 100644
--- a/tool/internal_pkg/pluginmode/protoc/protoc.go
+++ b/tool/internal_pkg/pluginmode/protoc/protoc.go
@@ -93,7 +93,7 @@ func GenKitex(req *pluginpb.CodeGeneratorRequest, opts protogen.Options) (*plugi
 		gopkg, ok := pp.importPaths[f.GetName()]
 		if ok {
 			f.Options.GoPackage = &gopkg
-			log.Infof("[INFO] option specified import path for %q: %q\n", f.GetName(), gopkg)
+			log.Debugf("option specified import path for %q: %q\n", f.GetName(), gopkg)
 		} else {
 			if f.Options == nil || f.Options.GoPackage == nil {
 				return nil, fmt.Errorf("ERROR: go_package is missing in proto file %q", f.GetName())
@@ -102,7 +102,7 @@ func GenKitex(req *pluginpb.CodeGeneratorRequest, opts protogen.Options) (*plugi
 		}
 		if path, ok := pe.getImportPath(gopkg); ok {
 			f.Options.GoPackage = &path
-			log.Infof("[INFO] update import path for %q: %q -> %q\n", f.GetName(), gopkg, path)
+			log.Debugf("update import path for %q: %q -> %q\n", f.GetName(), gopkg, path)
 		}
 	}
 
diff --git a/tool/internal_pkg/pluginmode/thriftgo/convertor.go b/tool/internal_pkg/pluginmode/thriftgo/convertor.go
index 2137eaaa2d..072d08616f 100644
--- a/tool/internal_pkg/pluginmode/thriftgo/convertor.go
+++ b/tool/internal_pkg/pluginmode/thriftgo/convertor.go
@@ -17,7 +17,6 @@ package thriftgo
 import (
 	"fmt"
 	"go/format"
-	"io"
 	"os"
 	"path/filepath"
 	"regexp"
@@ -31,7 +30,7 @@ import (
 	"github.com/cloudwego/thriftgo/semantic"
 
 	"github.com/cloudwego/kitex/tool/internal_pkg/generator"
-	internal_log "github.com/cloudwego/kitex/tool/internal_pkg/log"
+	"github.com/cloudwego/kitex/tool/internal_pkg/log"
 	"github.com/cloudwego/kitex/tool/internal_pkg/util"
 	"github.com/cloudwego/kitex/transport"
 )
@@ -80,20 +79,9 @@ func (c *converter) initLogs() backend.LogFunc {
 		lf.Info = lf.Warn
 	}
 
-	internal_log.SetDefaultLogger(internal_log.Logger{
-		Println: func(w io.Writer, a ...interface{}) (n int, err error) {
-			if w != os.Stdout || c.Config.Verbose {
-				c.Warnings = append(c.Warnings, fmt.Sprint(a...))
-			}
-			return 0, nil
-		},
-		Printf: func(w io.Writer, format string, a ...interface{}) (n int, err error) {
-			if w != os.Stdout || c.Config.Verbose {
-				c.Warnings = append(c.Warnings, fmt.Sprintf(format, a...))
-			}
-			return 0, nil
-		},
-	})
+	log.SetDefaultLogger(log.LoggerFunc(func(format string, a ...interface{}) {
+		c.Warnings = append(c.Warnings, fmt.Sprintf(format, a...))
+	}))
 	return lf
 }
 
@@ -516,13 +504,13 @@ func (c *converter) persist(res *plugin.Response) error {
 		content := []byte(c.Content)
 		if filepath.Ext(full) == ".go" {
 			if formatted, err := format.Source([]byte(c.Content)); err != nil {
-				internal_log.Warn(fmt.Sprintf("Failed to format %s: %s", full, err.Error()))
+				log.Warnf("Failed to format %s: %s", full, err)
 			} else {
 				content = formatted
 			}
 		}
 
-		internal_log.Info("Write", full)
+		log.Debug("Write", full)
 		path := filepath.Dir(full)
 		if err := os.MkdirAll(path, 0o755); err != nil && !os.IsExist(err) {
 			return fmt.Errorf("failed to create path '%s': %w", path, err)