diff --git a/bee.json b/bee.json
index 0c0ee71..41dced8 100644
--- a/bee.json
+++ b/bee.json
@@ -13,5 +13,9 @@
 		"others": []
 	},
 	"cmd_args": [],
-	"envs": []
+	"envs": [],
+	"database": {
+		"driver": "mysql",
+		"conn": "root:@tcp(127.0.0.1:3306)/test"
+	}
 }
\ No newline at end of file
diff --git a/conf.go b/conf.go
index 0561c0d..5a116b5 100644
--- a/conf.go
+++ b/conf.go
@@ -36,7 +36,11 @@ var defaultConf = `{
 		"others": []
 	},
 	"cmd_args": [],
-	"envs": []
+	"envs": [],
+	"database": {
+		"driver": "mysql",
+		"conn": "root:@tcp(127.0.0.1:3306)/test"
+	}
 }
 `
 var conf struct {
@@ -62,6 +66,10 @@ var conf struct {
 		Dirs   []string
 		IngExt []string `json:"ignore_ext"`
 	}
+	Database struct {
+		Driver string
+		Conn   string
+	}
 }
 
 // loadConfig loads customized configuration.
diff --git a/g.go b/g.go
index c1dc8df..2ca735d 100644
--- a/g.go
+++ b/g.go
@@ -43,12 +43,12 @@ bee generate docs
 bee generate test [routerfile]
     generate testcase
 
-bee generate appcode [-tables=""] [-driver=mysql] [-conn=root:@tcp(127.0.0.1:3306)/test] [-level=1]
+bee generate appcode [-tables=""] [-driver=mysql] [-conn=root:@tcp(127.0.0.1:3306)/test] [-level=3]
     generate appcode based on an existing database
     -tables: a list of table names separated by ',', default is empty, indicating all tables
     -driver: [mysql | postgresql | sqlite], the default is mysql
     -conn:   the connection string used by the driver, the default is root:@tcp(127.0.0.1:3306)/test
-    -level:  [1 | 2 | 3], 1 = model; 2 = models,controller; 3 = models,controllers,router		
+    -level:  [1 | 2 | 3], 1 = models; 2 = models,controllers; 3 = models,controllers,router		
 `,
 }
 
@@ -102,19 +102,30 @@ func generateCode(cmd *Command, args []string) {
 	case "docs":
 		generateDocs(curpath)
 	case "appcode":
+		// load config
+		err := loadConfig()
+		if err != nil {
+			ColorLog("[ERRO] Fail to parse bee.json[ %s ]\n", err)
+		}
 		cmd.Flag.Parse(args[1:])
 		if driver == "" {
-			driver = "mysql"
+			driver = docValue(conf.Database.Driver)
+			if driver == "" {
+				driver = "mysql"
+			}
 		}
 		if conn == "" {
-			conn = "root:@tcp(127.0.0.1:3306)/test"
+			conn = docValue(conf.Database.Conn)
+			if conn == "" {
+				conn = "root:@tcp(127.0.0.1:3306)/test"
+			}
 		}
 		if level == "" {
-			level = "1"
+			level = "3"
 		}
 		ColorLog("[INFO] Using '%s' as 'driver'\n", driver)
 		ColorLog("[INFO] Using '%s' as 'conn'\n", conn)
-		ColorLog("[INFO] Using '%s' as 'tables'", tables)
+		ColorLog("[INFO] Using '%s' as 'tables'\n", tables)
 		ColorLog("[INFO] Using '%s' as 'level'\n", level)
 		generateAppcode(string(driver), string(conn), string(level), string(tables), curpath)
 	case "migration":
diff --git a/migrate.go b/migrate.go
index a644aad..610d895 100644
--- a/migrate.go
+++ b/migrate.go
@@ -70,15 +70,26 @@ func runMigration(cmd *Command, args []string) {
 		ColorLog("[HINT] Set $GOPATH in your environment vairables\n")
 		os.Exit(2)
 	}
+	// load config
+	err := loadConfig()
+	if err != nil {
+		ColorLog("[ERRO] Fail to parse bee.json[ %s ]\n", err)
+	}
 	// getting command line arguments
 	if len(args) != 0 {
 		cmd.Flag.Parse(args[1:])
 	}
 	if mDriver == "" {
-		mDriver = "mysql"
+		mDriver = docValue(conf.Database.Driver)
+		if mDriver == "" {
+			mDriver = "mysql"
+		}
 	}
 	if mConn == "" {
-		mConn = "root:@tcp(127.0.0.1:3306)/test"
+		mConn = docValue(conf.Database.Conn)
+		if mConn == "" {
+			mConn = "root:@tcp(127.0.0.1:3306)/test"
+		}
 	}
 	ColorLog("[INFO] Using '%s' as 'driver'\n", mDriver)
 	ColorLog("[INFO] Using '%s' as 'conn'\n", mConn)