diff --git a/client/config/dfget.go b/client/config/dfget.go
index 3bcfbf6ed..1afde18a2 100644
--- a/client/config/dfget.go
+++ b/client/config/dfget.go
@@ -90,8 +90,8 @@ type ClientOption struct {
 	// eg: --header='Accept: *' --header='Host: abc'.
 	Header []string `yaml:"header,omitempty" mapstructure:"header,omitempty"`
 
-	// NotBackSource indicates whether to not back source to download when p2p fails.
-	NotBackSource bool `yaml:"not_back_source,omitempty" mapstructure:"not_back_source,omitempty"`
+	// DisableBackSource indicates whether to not back source to download when p2p fails.
+	DisableBackSource bool `yaml:"disable_back_source,omitempty" mapstructure:"disable_back_source,omitempty"`
 
 	// Insecure indicates whether skip secure verify when supernode interact with the source.
 	Insecure bool `yaml:"insecure,omitempty" mapstructure:"insecure,omitempty"`
diff --git a/client/config/dfget_darwin.go b/client/config/dfget_darwin.go
index 192e232d6..656f25418 100644
--- a/client/config/dfget_darwin.go
+++ b/client/config/dfget_darwin.go
@@ -26,17 +26,17 @@ var dfgetConfig = ClientOption{
 	Output:        "",
 	Timeout:       0,
 	BenchmarkRate: 128 * unit.KB,
-	RateLimit:     0,
-	Md5:           "",
-	DigestMethod:  "",
-	DigestValue:   "",
-	Identifier:    "",
-	CallSystem:    "",
-	Pattern:       "",
-	Cacerts:       nil,
-	Filter:        nil,
-	Header:        nil,
-	NotBackSource: false,
-	Insecure:      false,
-	ShowBar:       false,
+	RateLimit:         0,
+	Md5:               "",
+	DigestMethod:      "",
+	DigestValue:       "",
+	Identifier:        "",
+	CallSystem:        "",
+	Pattern:           "",
+	Cacerts:           nil,
+	Filter:            nil,
+	Header:            nil,
+	DisableBackSource: false,
+	Insecure:          false,
+	ShowBar:           false,
 }
diff --git a/client/config/dfget_linux.go b/client/config/dfget_linux.go
index 1712c8564..fdf68d2e0 100644
--- a/client/config/dfget_linux.go
+++ b/client/config/dfget_linux.go
@@ -22,17 +22,17 @@ var dfgetConfig = ClientOption{
 	URL:           "",
 	LockFile:      "/var/run/dfget.lock",
 	Output:        "",
-	Timeout:       0,
-	Md5:           "",
-	DigestMethod:  "",
-	DigestValue:   "",
-	Identifier:    "",
-	CallSystem:    "",
-	Pattern:       "",
-	Cacerts:       nil,
-	Filter:        nil,
-	Header:        nil,
-	NotBackSource: false,
-	Insecure:      false,
-	ShowBar:       false,
+	Timeout:           0,
+	Md5:               "",
+	DigestMethod:      "",
+	DigestValue:       "",
+	Identifier:        "",
+	CallSystem:        "",
+	Pattern:           "",
+	Cacerts:           nil,
+	Filter:            nil,
+	Header:            nil,
+	DisableBackSource: false,
+	Insecure:          false,
+	ShowBar:           false,
 }
diff --git a/client/dfget/dfget.go b/client/dfget/dfget.go
index 076ea5525..91369c18a 100644
--- a/client/dfget/dfget.go
+++ b/client/dfget/dfget.go
@@ -120,7 +120,7 @@ func Download(cfg *config.DfgetConfig, client dfclient.DaemonClient) error {
 }
 
 func downloadFromSource(cfg *config.DfgetConfig, hdr map[string]string) (err error) {
-	if cfg.NotBackSource {
+	if cfg.DisableBackSource {
 		err = fmt.Errorf("dfget download error, and back source disabled")
 		logger.Warnf("%s", err)
 		return err
diff --git a/cmd/dfget/cmd/root.go b/cmd/dfget/cmd/root.go
index 89e51e0b9..e7d032c64 100644
--- a/cmd/dfget/cmd/root.go
+++ b/cmd/dfget/cmd/root.go
@@ -18,6 +18,7 @@ package cmd
 
 import (
 	"context"
+	"fmt"
 	"os"
 	"os/exec"
 	"strconv"
@@ -85,6 +86,7 @@ var rootCmd = &cobra.Command{
 func Execute() {
 	if err := rootCmd.Execute(); err != nil {
 		logger.Error(err)
+		fmt.Println(err)
 		os.Exit(1)
 	}
 }
@@ -106,11 +108,7 @@ func init() {
 
 	flagSet.DurationP("timeout", "e", dfgetConfig.Timeout,
 		"timeout for file downloading task. If dfget has not finished downloading all pieces of file "+
-			"before --timeout, the dfget will throw an error and exit, default see --benchmark-rate")
-
-	flagSet.String("benchmark-rate", dfgetConfig.BenchmarkRate.String(),
-		"benchmark rate in format of G(B)/g/M(B)/m/K(B)/k/B which is used to calculate the default --timeout, "+
-			"calculation formula: fileLength/benchmark-rate")
+			"before --timeout, the dfget will throw an error and exit, 0 is infinite")
 
 	flagSet.String("limit", unit.Bytes(dfgetConfig.RateLimit).String(),
 		"network bandwidth rate limit in format of G(B)/g/M(B)/m/K(B)/k/B, pure number will be parsed as Byte, 0 is infinite")
@@ -125,8 +123,9 @@ func init() {
 		"filter some query params of url, use char '&' to separate different params, eg: -f 'key&sign' "+
 			"will filter 'key' and 'sign' query param. in this way, different urls can correspond to the same P2P task")
 
-	flagSet.Bool("not-back-source", dfgetConfig.NotBackSource,
-		"disable dfget downloading file directly from url source when peer fails to download file")
+	flagSet.Bool("disable-back-source", dfgetConfig.DisableBackSource,
+		"disable dfget downloading file directly from url source when peer fails to download file, "+
+			"--limit is invalid when peer downloads the file from source")
 
 	flagSet.StringP("pattern", "p", dfgetConfig.Pattern, "downloading pattern, must be p2p/cdn/source")
 
diff --git a/cmd/scheduler/cmd/root.go b/cmd/scheduler/cmd/root.go
index 8cdbb2e51..82c00ae2a 100644
--- a/cmd/scheduler/cmd/root.go
+++ b/cmd/scheduler/cmd/root.go
@@ -43,16 +43,16 @@ for deciding which peers transmit blocks to each other.`,
 	DisableAutoGenTag: true,
 	SilenceUsage:      true,
 	RunE: func(cmd *cobra.Command, args []string) error {
-		// Validate config
-		if err := cfg.Validate(); err != nil {
-			return err
-		}
-
 		// Initialize logger
 		if err := logcore.InitScheduler(cfg.Console); err != nil {
 			return errors.Wrap(err, "init scheduler logger")
 		}
 
+		// Validate config
+		if err := cfg.Validate(); err != nil {
+			return err
+		}
+
 		return runScheduler()
 	},
 }