diff --git a/handler/dnspod_handler.go b/handler/dnspod_handler.go
index 4501cb2..f236062 100644
--- a/handler/dnspod_handler.go
+++ b/handler/dnspod_handler.go
@@ -32,8 +32,6 @@ func (handler *DNSPodHandler) DomainLoop(domain *godns.Domain, panicChan chan<-
 	defer func() {
 		if err := recover(); err != nil {
 			log.Printf("Recovered in %v: %v\n", err, debug.Stack())
-			fmt.Println(godns.IdentifyPanic())
-			log.Print(godns.IdentifyPanic())
 			panicChan <- *domain
 		}
 	}()
diff --git a/handler/he_handler.go b/handler/he_handler.go
index 69a755c..9a34e77 100644
--- a/handler/he_handler.go
+++ b/handler/he_handler.go
@@ -35,8 +35,6 @@ func (handler *HEHandler) DomainLoop(domain *godns.Domain, panicChan chan<- godn
 	defer func() {
 		if err := recover(); err != nil {
 			log.Printf("Recovered in %v: %v\n", err, debug.Stack())
-			fmt.Println(godns.IdentifyPanic())
-			log.Print(godns.IdentifyPanic())
 			panicChan <- *domain
 		}
 	}()
diff --git a/utils.go b/utils.go
index 37a028d..1932d78 100644
--- a/utils.go
+++ b/utils.go
@@ -2,13 +2,9 @@ package godns
 
 import (
 	"errors"
-	"flag"
-	"fmt"
 	"io/ioutil"
 	"log"
 	"net/http"
-	"runtime"
-	"strings"
 
 	"golang.org/x/net/proxy"
 )
@@ -31,10 +27,9 @@ func GetCurrentIP(configuration *Settings) (string, error) {
 	if configuration.Socks5Proxy != "" {
 
 		log.Println("use socks5 proxy:" + configuration.Socks5Proxy)
-
 		dialer, err := proxy.SOCKS5("tcp", configuration.Socks5Proxy, nil, proxy.Direct)
 		if err != nil {
-			fmt.Println("can't connect to the proxy:", err)
+			log.Println("can't connect to the proxy:", err)
 			return "", err
 		}
 
@@ -56,41 +51,6 @@ func GetCurrentIP(configuration *Settings) (string, error) {
 	return string(body), nil
 }
 
-// IdentifyPanic identifies panic and output the detailed panic information
-func IdentifyPanic() string {
-	var name, file string
-	var line int
-	var pc [16]uintptr
-
-	n := runtime.Callers(3, pc[:])
-	for _, pc := range pc[:n] {
-		fn := runtime.FuncForPC(pc)
-		if fn == nil {
-			continue
-		}
-		file, line = fn.FileLine(pc)
-		name = fn.Name()
-		if !strings.HasPrefix(name, "runtime.") {
-			break
-		}
-	}
-
-	switch {
-	case name != "":
-		return fmt.Sprintf("%v:%v", name, line)
-	case file != "":
-		return fmt.Sprintf("%v:%v", file, line)
-	}
-
-	return fmt.Sprintf("pc:%x", pc)
-}
-
-// Usage prints the usage of GoDNS
-func Usage() {
-	log.Println("[command] -c=[config file path]")
-	flag.PrintDefaults()
-}
-
 // CheckSettings check the format of settings
 func CheckSettings(config *Settings) error {
 	if config.Provider == DNSPOD {
diff --git a/utils_test.go b/utils_test.go
index 6e2241e..fcc51b8 100644
--- a/utils_test.go
+++ b/utils_test.go
@@ -4,7 +4,7 @@ import (
 	"testing"
 )
 
-func testGetCurrentIP(t *testing.T) {
+func TestGetCurrentIP(t *testing.T) {
 	conf := &Settings{IPUrl: "http://members.3322.org/dyndns/getip"}
 	ip, _ := GetCurrentIP(conf)
 
@@ -14,3 +14,24 @@ func testGetCurrentIP(t *testing.T) {
 		t.Log("IP is:" + ip)
 	}
 }
+
+func TestCheckSettings(t *testing.T) {
+	settingError := &Settings{}
+	if err := CheckSettings(settingError); err == nil {
+		t.Error("setting is invalid, should return error")
+	}
+
+	settingDNSPod := &Settings{Provider: "DNSPod", LoginToken: "aaa"}
+	if err := CheckSettings(settingDNSPod); err == nil {
+		t.Log("setting with login token, passed")
+	} else {
+		t.Error("setting with login token, should be passed")
+	}
+
+	settingHE := &Settings{Provider: "HE", Password: ""}
+	if err := CheckSettings(settingHE); err != nil {
+		t.Log("HE setting without password, passed")
+	} else {
+		t.Error("HE setting without password, should be faild")
+	}
+}