diff --git a/bale.go b/bale.go
index 03f8b7f..64c275d 100644
--- a/bale.go
+++ b/bale.go
@@ -54,7 +54,7 @@ func runBale(cmd *Command, args []string) {
 
 	// Pack and compress data.
 	for _, p := range conf.Bale.Dirs {
-		if !IsExist(p) {
+		if !isExist(p) {
 			ColorLog("[WARN] Skipped directory( %s )\n", p)
 			continue
 		}
diff --git a/bee.json b/bee.json
index 4665137..832c49a 100644
--- a/bee.json
+++ b/bee.json
@@ -1,7 +1,11 @@
 {
+	"version": 0,
+	"gopm": {
+		"enable": false
+	},
 	"go_install": false,
 	"watch_ext": [],
-	"dir_structure":{
+	"dir_structure": {
 		"controllers": "",
 		"models": "",
 		"others": []
diff --git a/conf.go b/conf.go
new file mode 100644
index 0000000..ab73e9f
--- /dev/null
+++ b/conf.go
@@ -0,0 +1,96 @@
+// Copyright 2013 bee authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License"): you may
+// not use this file except in compliance with the License. You may obtain
+// a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+// License for the specific language governing permissions and limitations
+// under the License.
+
+package main
+
+import (
+	"encoding/json"
+	"os"
+)
+
+const CONF_VER = 0
+
+var defaultConf = `{
+	"version": 0,
+	"gopm": {
+		"enable": false,
+	},
+	"go_install": false,
+	"watch_ext": [],
+	"dir_structure":{
+		"controllers": "",
+		"models": "",
+		"others": []
+	}
+}
+`
+var conf struct {
+	Version int
+	// gopm support
+	Gopm struct {
+		Enable bool
+	}
+	// Indicates whether execute "go install" before "go build".
+	GoInstall bool     `json:"go_install"`
+	WatchExt  []string `json:"watch_ext"`
+	DirStruct struct {
+		Controllers string
+		Models      string
+		Others      []string // Other directories.
+	} `json:"dir_structure"`
+
+	Bale struct {
+		Import string
+		Dirs   []string
+		IngExt []string `json:"ignore_ext"`
+	}
+}
+
+// loadConfig loads customized configuration.
+func loadConfig() error {
+	f, err := os.Open("bee.json")
+	if err != nil {
+		// Use default.
+		err = json.Unmarshal([]byte(defaultConf), &conf)
+		if err != nil {
+			return err
+		}
+	} else {
+		defer f.Close()
+		ColorLog("[INFO] Detected bee.json\n")
+		d := json.NewDecoder(f)
+		err = d.Decode(&conf)
+		if err != nil {
+			return err
+		}
+	}
+
+	// Check format version.
+	if conf.Version != CONF_VER {
+		ColorLog("[WARN] Your bee.json is out-of-date, please update!\n")
+		ColorLog("[HINT] Compare bee.json under bee source code path and yours\n")
+	}
+
+	// Set variables.
+	if len(conf.DirStruct.Controllers) == 0 {
+		conf.DirStruct.Controllers = "controllers"
+	}
+	if len(conf.DirStruct.Models) == 0 {
+		conf.DirStruct.Models = "models"
+	}
+
+	// Append watch exts.
+	watchExts = append(watchExts, conf.WatchExt...)
+	return nil
+}
diff --git a/run.go b/run.go
index 3749234..9413df8 100644
--- a/run.go
+++ b/run.go
@@ -15,7 +15,6 @@
 package main
 
 import (
-	"encoding/json"
 	"os"
 	path "path/filepath"
 	"runtime"
@@ -44,42 +43,11 @@ when the file has changed bee will auto go build and restart the app
 `,
 }
 
-var defaultJson = `
-{
-	"go_install": false,
-	"dir_structure":{
-		"controllers": "",
-		"models": "",
-		"others": []
-	},
-	"main_files":{
-		"main.go": "",
-		"others": []
-	}
-}
-`
-
 func init() {
 	cmdRun.Run = runApp
 }
 
 var appname string
-var conf struct {
-	// Indicates whether execute "go install" before "go build".
-	GoInstall bool     `json:"go_install"`
-	WatchExt  []string `json:"watch_ext"`
-	DirStruct struct {
-		Controllers string
-		Models      string
-		Others      []string // Other directories.
-	} `json:"dir_structure"`
-
-	Bale struct {
-		Import string
-		Dirs   []string
-		IngExt []string `json:"ignore_ext"`
-	}
-}
 
 func runApp(cmd *Command, args []string) {
 	exit := make(chan bool)
@@ -96,6 +64,7 @@ func runApp(cmd *Command, args []string) {
 	if err != nil {
 		ColorLog("[ERRO] Fail to parse bee.json[ %s ]\n", err)
 	}
+
 	var paths []string
 	paths = append(paths,
 		path.Join(crupath, conf.DirStruct.Controllers),
@@ -122,34 +91,3 @@ func runApp(cmd *Command, args []string) {
 		}
 	}
 }
-
-// loadConfig loads customized configuration.
-func loadConfig() error {
-	f, err := os.Open("bee.json")
-	if err != nil {
-		// Use default.
-		err = json.Unmarshal([]byte(defaultJson), &conf)
-		if err != nil {
-			return err
-		}
-	} else {
-		defer f.Close()
-		ColorLog("[INFO] Detected bee.json\n")
-		d := json.NewDecoder(f)
-		err = d.Decode(&conf)
-		if err != nil {
-			return err
-		}
-	}
-	// Set variables.
-	if len(conf.DirStruct.Controllers) == 0 {
-		conf.DirStruct.Controllers = "controllers"
-	}
-	if len(conf.DirStruct.Models) == 0 {
-		conf.DirStruct.Models = "models"
-	}
-
-	// Append watch exts.
-	watchExts = append(watchExts, conf.WatchExt...)
-	return nil
-}
diff --git a/util.go b/util.go
index 1a53774..250eee9 100644
--- a/util.go
+++ b/util.go
@@ -153,7 +153,7 @@ func getColorLevel(level string) string {
 }
 
 // IsExist returns whether a file or directory exists.
-func IsExist(path string) bool {
+func isExist(path string) bool {
 	_, err := os.Stat(path)
 	return err == nil || os.IsExist(err)
 }
diff --git a/watch.go b/watch.go
index 11df0db..211e904 100644
--- a/watch.go
+++ b/watch.go
@@ -111,18 +111,23 @@ func Autobuild() {
 	path, _ := os.Getwd()
 	os.Chdir(path)
 
+	cmdName := "go"
+	if conf.Gopm.Enable {
+		cmdName = "gopm"
+	}
+
 	var err error
 	// For applications use full import path like "github.com/.../.."
 	// are able to use "go install" to reduce build time.
 	if conf.GoInstall {
-		icmd := exec.Command("go", "install")
+		icmd := exec.Command(cmdName, "install")
 		icmd.Stdout = os.Stdout
 		icmd.Stderr = os.Stderr
 		err = icmd.Run()
 	}
 
 	if err == nil {
-		bcmd := exec.Command("go", "build")
+		bcmd := exec.Command(cmdName, "build")
 		bcmd.Stdout = os.Stdout
 		bcmd.Stderr = os.Stderr
 		err = bcmd.Run()