diff --git a/config/config.go b/config/config.go
index 101bc66d..63ca7c48 100644
--- a/config/config.go
+++ b/config/config.go
@@ -4,9 +4,10 @@ import (
 	"fmt"
 )
 
+// ConfigContainer defines how to get and set value from configuration raw data.
 type ConfigContainer interface {
-	Set(key, val string) error
-	String(key string) string
+	Set(key, val string) error // support section::key type in given key when using ini type.
+	String(key string) string // support section::key type in key string when using ini and json type; Int,Int64,Bool,Float,DIY are same.
 	Int(key string) (int, error)
 	Int64(key string) (int64, error)
 	Bool(key string) (bool, error)
@@ -14,6 +15,7 @@ type ConfigContainer interface {
 	DIY(key string) (interface{}, error)
 }
 
+// Config is the adapter interface for parsing config file to get raw data to ConfigContainer.
 type Config interface {
 	Parse(key string) (ConfigContainer, error)
 }
@@ -33,8 +35,8 @@ func Register(name string, adapter Config) {
 	adapters[name] = adapter
 }
 
-// adapterNamer is ini/json/xml/yaml
-// filename is the config file path
+// adapterName is ini/json/xml/yaml.
+// filename is the config file path.
 func NewConfig(adapterName, fileaname string) (ConfigContainer, error) {
 	adapter, ok := adapters[adapterName]
 	if !ok {
diff --git a/config/ini.go b/config/ini.go
index 4739824d..2ca4b030 100644
--- a/config/ini.go
+++ b/config/ini.go
@@ -13,21 +13,21 @@ import (
 )
 
 var (
-	DEFAULT_SECTION = "default"
-	bNumComment     = []byte{'#'} // number sign
-	bSemComment     = []byte{';'} // semicolon
+	DEFAULT_SECTION = "default" // default section means if some ini items not in a section, make them in default section,
+	bNumComment     = []byte{'#'} // number signal
+	bSemComment     = []byte{';'} // semicolon signal
 	bEmpty          = []byte{}
-	bEqual          = []byte{'='}
-	bDQuote         = []byte{'"'}
-	sectionStart    = []byte{'['}
-	sectionEnd      = []byte{']'}
+	bEqual          = []byte{'='} // equal signal
+	bDQuote         = []byte{'"'} // quote signal
+	sectionStart    = []byte{'['} // section start signal
+	sectionEnd      = []byte{']'} // section end signal
 )
 
+// IniConfig implements Config to parse ini file.
 type IniConfig struct {
 }
 
-// ParseFile creates a new Config and parses the file configuration from the
-// named file.
+// ParseFile creates a new Config and parses the file configuration from the named file.
 func (ini *IniConfig) Parse(name string) (ConfigContainer, error) {
 	file, err := os.Open(name)
 	if err != nil {
@@ -106,11 +106,12 @@ func (ini *IniConfig) Parse(name string) (ConfigContainer, error) {
 	return cfg, nil
 }
 
-// A Config represents the configuration.
+// A Config represents the ini configuration.
+// When set and get value, support key as section:name type.
 type IniConfigContainer struct {
 	filename       string
-	data           map[string]map[string]string //section=> key:val
-	sectionComment map[string]string            //sction : comment
+	data           map[string]map[string]string // section=> key:val
+	sectionComment map[string]string            // section : comment
 	keycomment     map[string]string            // id: []{comment, key...}; id 1 is for main comment.
 	sync.RWMutex
 }
@@ -127,6 +128,7 @@ func (c *IniConfigContainer) Int(key string) (int, error) {
 	return strconv.Atoi(c.getdata(key))
 }
 
+// Int64 returns the int64 value for a given key.
 func (c *IniConfigContainer) Int64(key string) (int64, error) {
 	key = strings.ToLower(key)
 	return strconv.ParseInt(c.getdata(key), 10, 64)
@@ -145,6 +147,8 @@ func (c *IniConfigContainer) String(key string) string {
 }
 
 // WriteValue writes a new value for key.
+// if write to one section, the key need be "section::key".
+// if the section is not existed, it panics.
 func (c *IniConfigContainer) Set(key, value string) error {
 	c.Lock()
 	defer c.Unlock()
@@ -166,6 +170,7 @@ func (c *IniConfigContainer) Set(key, value string) error {
 	return nil
 }
 
+// DIY returns the raw value by a given key.
 func (c *IniConfigContainer) DIY(key string) (v interface{}, err error) {
 	key = strings.ToLower(key)
 	if v, ok := c.data[key]; ok {
@@ -174,7 +179,7 @@ func (c *IniConfigContainer) DIY(key string) (v interface{}, err error) {
 	return v, errors.New("key not find")
 }
 
-//section.key or key
+// section.key or key
 func (c *IniConfigContainer) getdata(key string) string {
 	c.RLock()
 	defer c.RUnlock()
diff --git a/config/json.go b/config/json.go
index b401e1b3..a74ac7df 100644
--- a/config/json.go
+++ b/config/json.go
@@ -9,9 +9,11 @@ import (
 	"sync"
 )
 
+// JsonConfig is a json config parser and implements Config interface.
 type JsonConfig struct {
 }
 
+// Parse returns a ConfigContainer with parsed json config map.
 func (js *JsonConfig) Parse(filename string) (ConfigContainer, error) {
 	file, err := os.Open(filename)
 	if err != nil {
@@ -32,11 +34,14 @@ func (js *JsonConfig) Parse(filename string) (ConfigContainer, error) {
 	return x, nil
 }
 
+// A Config represents the json configuration.
+// Only when get value, support key as section:name type.
 type JsonConfigContainer struct {
 	data map[string]interface{}
 	sync.RWMutex
 }
 
+// Bool returns the boolean value for a given key.
 func (c *JsonConfigContainer) Bool(key string) (bool, error) {
 	val := c.getdata(key)
 	if val != nil {
@@ -48,9 +53,10 @@ func (c *JsonConfigContainer) Bool(key string) (bool, error) {
 	} else {
 		return false, errors.New("not exist key:" + key)
 	}
-
+	return false,nil
 }
 
+// Int returns the integer value for a given key.
 func (c *JsonConfigContainer) Int(key string) (int, error) {
 	val := c.getdata(key)
 	if val != nil {
@@ -62,8 +68,10 @@ func (c *JsonConfigContainer) Int(key string) (int, error) {
 	} else {
 		return 0, errors.New("not exist key:" + key)
 	}
+	return 0,nil
 }
 
+// Int64 returns the int64 value for a given key.
 func (c *JsonConfigContainer) Int64(key string) (int64, error) {
 	val := c.getdata(key)
 	if val != nil {
@@ -75,8 +83,10 @@ func (c *JsonConfigContainer) Int64(key string) (int64, error) {
 	} else {
 		return 0, errors.New("not exist key:" + key)
 	}
+	return 0,nil
 }
 
+// Float returns the float value for a given key.
 func (c *JsonConfigContainer) Float(key string) (float64, error) {
 	val := c.getdata(key)
 	if val != nil {
@@ -88,8 +98,10 @@ func (c *JsonConfigContainer) Float(key string) (float64, error) {
 	} else {
 		return 0.0, errors.New("not exist key:" + key)
 	}
+	return 0.0,nil
 }
 
+// String returns the string value for a given key.
 func (c *JsonConfigContainer) String(key string) string {
 	val := c.getdata(key)
 	if val != nil {
@@ -101,8 +113,10 @@ func (c *JsonConfigContainer) String(key string) string {
 	} else {
 		return ""
 	}
+	return ""
 }
 
+// WriteValue writes a new value for key.
 func (c *JsonConfigContainer) Set(key, val string) error {
 	c.Lock()
 	defer c.Unlock()
@@ -110,6 +124,7 @@ func (c *JsonConfigContainer) Set(key, val string) error {
 	return nil
 }
 
+// DIY returns the raw value by a given key.
 func (c *JsonConfigContainer) DIY(key string) (v interface{}, err error) {
 	val := c.getdata(key)
 	if val != nil {
@@ -117,9 +132,10 @@ func (c *JsonConfigContainer) DIY(key string) (v interface{}, err error) {
 	} else {
 		return nil, errors.New("not exist key")
 	}
+	return nil,nil
 }
 
-//section.key or key
+// section.key or key
 func (c *JsonConfigContainer) getdata(key string) interface{} {
 	c.RLock()
 	defer c.RUnlock()
diff --git a/config/xml.go b/config/xml.go
index 7f3807ef..7bc0ec02 100644
--- a/config/xml.go
+++ b/config/xml.go
@@ -1,4 +1,3 @@
-//xml parse should incluce in <config></config> tags
 
 package config
 
@@ -12,9 +11,13 @@ import (
 	"github.com/beego/x2j"
 )
 
+// XmlConfig is a xml config parser and implements Config interface.
+// xml configurations should be included in <config></config> tag.
+// only support key/value pair as <key>value</key> as each item.
 type XMLConfig struct {
 }
 
+// Parse returns a ConfigContainer with parsed xml config map.
 func (xmls *XMLConfig) Parse(filename string) (ConfigContainer, error) {
 	file, err := os.Open(filename)
 	if err != nil {
@@ -36,27 +39,33 @@ func (xmls *XMLConfig) Parse(filename string) (ConfigContainer, error) {
 	return x, nil
 }
 
+// A Config represents the xml configuration.
 type XMLConfigContainer struct {
 	data map[string]interface{}
 	sync.Mutex
 }
 
+// Bool returns the boolean value for a given key.
 func (c *XMLConfigContainer) Bool(key string) (bool, error) {
 	return strconv.ParseBool(c.data[key].(string))
 }
 
+// Int returns the integer value for a given key.
 func (c *XMLConfigContainer) Int(key string) (int, error) {
 	return strconv.Atoi(c.data[key].(string))
 }
 
+// Int64 returns the int64 value for a given key.
 func (c *XMLConfigContainer) Int64(key string) (int64, error) {
 	return strconv.ParseInt(c.data[key].(string), 10, 64)
 }
 
+// Float returns the float value for a given key.
 func (c *XMLConfigContainer) Float(key string) (float64, error) {
 	return strconv.ParseFloat(c.data[key].(string), 64)
 }
 
+// String returns the string value for a given key.
 func (c *XMLConfigContainer) String(key string) string {
 	if v, ok := c.data[key].(string); ok {
 		return v
@@ -64,6 +73,7 @@ func (c *XMLConfigContainer) String(key string) string {
 	return ""
 }
 
+// WriteValue writes a new value for key.
 func (c *XMLConfigContainer) Set(key, val string) error {
 	c.Lock()
 	defer c.Unlock()
@@ -71,6 +81,7 @@ func (c *XMLConfigContainer) Set(key, val string) error {
 	return nil
 }
 
+// DIY returns the raw value by a given key.
 func (c *XMLConfigContainer) DIY(key string) (v interface{}, err error) {
 	if v, ok := c.data[key]; ok {
 		return v, nil
diff --git a/config/yaml.go b/config/yaml.go
index 04bb0940..394cb3b2 100644
--- a/config/yaml.go
+++ b/config/yaml.go
@@ -12,9 +12,11 @@ import (
 	"github.com/beego/goyaml2"
 )
 
+// YAMLConfig is a yaml config parser and implements Config interface.
 type YAMLConfig struct {
 }
 
+// Parse returns a ConfigContainer with parsed yaml config map.
 func (yaml *YAMLConfig) Parse(filename string) (ConfigContainer, error) {
 	y := &YAMLConfigContainer{
 		data: make(map[string]interface{}),
@@ -27,7 +29,8 @@ func (yaml *YAMLConfig) Parse(filename string) (ConfigContainer, error) {
 	return y, nil
 }
 
-// 从Reader读取YAML
+// Read yaml file to map.
+// if json like, use json package, unless goyaml2 package.
 func ReadYmlReader(path string) (cnf map[string]interface{}, err error) {
 	err = nil
 	f, err := os.Open(path)
@@ -68,11 +71,13 @@ func ReadYmlReader(path string) (cnf map[string]interface{}, err error) {
 	return
 }
 
+// A Config represents the yaml configuration.
 type YAMLConfigContainer struct {
 	data map[string]interface{}
 	sync.Mutex
 }
 
+// Bool returns the boolean value for a given key.
 func (c *YAMLConfigContainer) Bool(key string) (bool, error) {
 	if v, ok := c.data[key].(bool); ok {
 		return v, nil
@@ -80,6 +85,7 @@ func (c *YAMLConfigContainer) Bool(key string) (bool, error) {
 	return false, errors.New("not bool value")
 }
 
+// Int returns the integer value for a given key.
 func (c *YAMLConfigContainer) Int(key string) (int, error) {
 	if v, ok := c.data[key].(int64); ok {
 		return int(v), nil
@@ -87,6 +93,7 @@ func (c *YAMLConfigContainer) Int(key string) (int, error) {
 	return 0, errors.New("not int value")
 }
 
+// Int64 returns the int64 value for a given key.
 func (c *YAMLConfigContainer) Int64(key string) (int64, error) {
 	if v, ok := c.data[key].(int64); ok {
 		return v, nil
@@ -94,6 +101,7 @@ func (c *YAMLConfigContainer) Int64(key string) (int64, error) {
 	return 0, errors.New("not bool value")
 }
 
+// Float returns the float value for a given key.
 func (c *YAMLConfigContainer) Float(key string) (float64, error) {
 	if v, ok := c.data[key].(float64); ok {
 		return v, nil
@@ -101,6 +109,7 @@ func (c *YAMLConfigContainer) Float(key string) (float64, error) {
 	return 0.0, errors.New("not float64 value")
 }
 
+// String returns the string value for a given key.
 func (c *YAMLConfigContainer) String(key string) string {
 	if v, ok := c.data[key].(string); ok {
 		return v
@@ -108,6 +117,7 @@ func (c *YAMLConfigContainer) String(key string) string {
 	return ""
 }
 
+// WriteValue writes a new value for key.
 func (c *YAMLConfigContainer) Set(key, val string) error {
 	c.Lock()
 	defer c.Unlock()
@@ -115,6 +125,7 @@ func (c *YAMLConfigContainer) Set(key, val string) error {
 	return nil
 }
 
+// DIY returns the raw value by a given key.
 func (c *YAMLConfigContainer) DIY(key string) (v interface{}, err error) {
 	if v, ok := c.data[key]; ok {
 		return v, nil