diff --git a/Global/global.go b/Global/global.go
new file mode 100644
index 0000000..3a376cb
--- /dev/null
+++ b/Global/global.go
@@ -0,0 +1,5 @@
+package Global
+
+import "Mmx/Modles"
+
+var Config *Modles.Config
diff --git a/Modles/config.go b/Modles/config.go
index 1ce15a8..1fa9ab5 100644
--- a/Modles/config.go
+++ b/Modles/config.go
@@ -1,6 +1,12 @@
 package Modles
 
-type Config struct {
-	From LoginForm
-	Meta LoginMeta
+type Settings struct {
+	QuitIfNetOk bool `json:"quit_if_net_ok"`
+	DemoMode    bool `json:"demo_mode"`
+}
+
+type Config struct {
+	From     LoginForm `json:"from"`
+	Meta     LoginMeta `json:"meta"`
+	Settings Settings  `json:"settings"`
 }
diff --git a/Util/config.go b/Util/config.go
index beb8fcc..c5545fd 100644
--- a/Util/config.go
+++ b/Util/config.go
@@ -1,6 +1,7 @@
 package Util
 
 import (
+	"Mmx/Global"
 	"Mmx/Modles"
 	"fmt"
 	"os"
@@ -55,6 +56,8 @@ func (a *config) Init() *Modles.LoginInfo {
 		os.Exit(3)
 	}
 
+	Global.Config = &c
+
 	return a.Generate(
 		&c.From,
 		&c.Meta,
diff --git a/Util/util.go b/Util/util.go
index 0b267b2..5aa01b0 100644
--- a/Util/util.go
+++ b/Util/util.go
@@ -1,11 +1,13 @@
 package Util
 
 import (
+	"Mmx/Global"
 	"crypto/md5"
 	"crypto/sha1"
 	"errors"
 	"fmt"
 	"io"
+	"os"
 	"regexp"
 )
 
@@ -45,3 +47,14 @@ func Sha1(content string) string {
 	bs := h.Sum(nil)
 	return fmt.Sprintf("%x\n", bs)
 }
+
+func ErrHandler(err error) {
+	if err != nil {
+		fmt.Println("Error occurred")
+		if Global.Config.Settings.DemoMode {
+			panic(err)
+		}
+		fmt.Println(err)
+		os.Exit(3)
+	}
+}
diff --git a/main.go b/main.go
index 592ae3f..d1d2972 100644
--- a/main.go
+++ b/main.go
@@ -1,33 +1,27 @@
 package main
 
 import (
+	"Mmx/Global"
 	"Mmx/Request"
 	"Mmx/Util"
 	"encoding/json"
 	"fmt"
 )
 
-func ErrHandler(err error) {
-	if err != nil {
-		fmt.Println("Error occurred")
-		panic(err)
-	}
-}
-
 func main() {
-	if Util.Checker.NetOk() {
+	G := Util.Config.Init()
+
+	if Global.Config.Settings.QuitIfNetOk && Util.Checker.NetOk() {
 		fmt.Println("There's no need to login")
 		return
 	}
 
-	G := Util.Config.Init()
-
 	fmt.Println("Step1: Get local ip returned from srun server.")
 	{
 		body, err := Request.Get(G.UrlLoginPage, nil)
-		ErrHandler(err)
+		Util.ErrHandler(err)
 		G.Ip, err = Util.GetIp(body)
-		ErrHandler(err)
+		Util.ErrHandler(err)
 	}
 	fmt.Println("Step2: Get token by resolving challenge result.")
 	{
@@ -36,11 +30,11 @@ func main() {
 			"username": G.Form.UserName,
 			"ip":       G.Ip,
 		})
-		ErrHandler(err)
+		Util.ErrHandler(err)
 		G.Token, err = Util.GetToken(data)
-		ErrHandler(err)
+		Util.ErrHandler(err)
 	}
-	fmt.Println("Step3: Loggin and resolve response.")
+	fmt.Println("Step3: Login and resolve response.")
 	{
 		info, err := json.Marshal(map[string]string{
 			"username": G.Form.UserName,
@@ -49,7 +43,7 @@ func main() {
 			"acid":     G.Meta.Acid,
 			"enc_ver":  G.Meta.Enc,
 		})
-		ErrHandler(err)
+		Util.ErrHandler(err)
 		G.EncryptedInfo = "{SRBX1}" + Util.Base64(Util.XEncode(string(info), G.Token))
 		G.Md5 = Util.Md5(G.Token)
 		G.EncryptedMd5 = "{MD5}" + G.Md5
@@ -80,9 +74,9 @@ func main() {
 			"double_stack": "0",
 			"_":            "1602812428675",
 		})
-		ErrHandler(err)
+		Util.ErrHandler(err)
 		G.LoginResult, err = Util.GetResult(res)
-		ErrHandler(err)
+		Util.ErrHandler(err)
 	}
-	fmt.Println("The loggin result is: " + G.LoginResult)
+	fmt.Println("The login result is: " + G.LoginResult)
 }