diff --git a/context/context.go b/context/context.go
index e2a82652..ee308476 100644
--- a/context/context.go
+++ b/context/context.go
@@ -6,6 +6,8 @@ import (
 	"github.com/astaxie/beego/middleware"
 )
 
+// Http request context struct including BeegoInput, BeegoOutput, http.Request and http.ResponseWriter.
+// BeegoInput and BeegoOutput provides some api to operate request and response more easily.
 type Context struct {
 	Input          *BeegoInput
 	Output         *BeegoOutput
@@ -13,11 +15,16 @@ type Context struct {
 	ResponseWriter http.ResponseWriter
 }
 
+// Redirect does redirection to localurl with http header status code.
+// It sends http response header directly.
 func (ctx *Context) Redirect(status int, localurl string) {
 	ctx.Output.Header("Location", localurl)
 	ctx.Output.SetStatus(status)
 }
 
+// Abort stops this request.
+// if middleware.ErrorMaps exists, panic body.
+// if middleware.HTTPExceptionMaps exists, panic HTTPException struct with status and body string.
 func (ctx *Context) Abort(status int, body string) {
 	ctx.Output.SetStatus(status)
 	// first panic from ErrorMaps, is is user defined error functions.
@@ -35,14 +42,20 @@ func (ctx *Context) Abort(status int, body string) {
 	panic(body)
 }
 
+// Write string to response body.
+// it sends response body.
 func (ctx *Context) WriteString(content string) {
 	ctx.Output.Body([]byte(content))
 }
 
+// Get cookie from request by a given key.
+// It's alias of BeegoInput.Cookie.
 func (ctx *Context) GetCookie(key string) string {
 	return ctx.Input.Cookie(key)
 }
 
+// Set cookie for response.
+// It's alias of BeegoOutput.Cookie.
 func (ctx *Context) SetCookie(name string, value string, others ...interface{}) {
 	ctx.Output.Cookie(name, value, others...)
 }
diff --git a/context/input.go b/context/input.go
index e9fc5295..308dd77c 100644
--- a/context/input.go
+++ b/context/input.go
@@ -10,14 +10,17 @@ import (
 	"github.com/astaxie/beego/session"
 )
 
+// BeegoInput operates the http request header ,data ,cookie and body.
+// it also contains router params and current session.
 type BeegoInput struct {
 	CruSession  session.SessionStore
 	Params      map[string]string
-	Data        map[interface{}]interface{}
+	Data        map[interface{}]interface{} // store some values in this context when calling context in filter or controller.
 	Request     *http.Request
 	RequestBody []byte
 }
 
+// NewInput return BeegoInput generated by http.Request.
 func NewInput(req *http.Request) *BeegoInput {
 	return &BeegoInput{
 		Params:  make(map[string]string),
@@ -26,22 +29,27 @@ func NewInput(req *http.Request) *BeegoInput {
 	}
 }
 
+// Protocol returns request protocol name, such as HTTP/1.1 .
 func (input *BeegoInput) Protocol() string {
 	return input.Request.Proto
 }
 
+// Uri returns full request url with query string, fragment.
 func (input *BeegoInput) Uri() string {
 	return input.Request.RequestURI
 }
 
+// Url returns request url path (without query string, fragment).
 func (input *BeegoInput) Url() string {
 	return input.Request.URL.String()
 }
 
+// Site returns base site url as scheme://domain type.
 func (input *BeegoInput) Site() string {
 	return input.Scheme() + "://" + input.Domain()
 }
 
+// Scheme returns request scheme as "http" or "https".
 func (input *BeegoInput) Scheme() string {
 	if input.Request.URL.Scheme != "" {
 		return input.Request.URL.Scheme
@@ -52,10 +60,14 @@ func (input *BeegoInput) Scheme() string {
 	}
 }
 
+// Domain returns host name.
+// Alias of Host method.
 func (input *BeegoInput) Domain() string {
 	return input.Host()
 }
 
+// Host returns host name.
+// if no host info in request, return localhost.
 func (input *BeegoInput) Host() string {
 	if input.Request.Host != "" {
 		hostParts := strings.Split(input.Request.Host, ":")
@@ -67,30 +79,39 @@ func (input *BeegoInput) Host() string {
 	return "localhost"
 }
 
+// Method returns http request method.
 func (input *BeegoInput) Method() string {
 	return input.Request.Method
 }
 
+// Is returns boolean of this request is on given method, such as Is("POST").
 func (input *BeegoInput) Is(method string) bool {
 	return input.Method() == method
 }
 
+// IsAjax returns boolean of this request is generated by ajax.
 func (input *BeegoInput) IsAjax() bool {
 	return input.Header("X-Requested-With") == "XMLHttpRequest"
 }
 
+// IsSecure returns boolean of this request is in https.
 func (input *BeegoInput) IsSecure() bool {
 	return input.Scheme() == "https"
 }
 
+// IsSecure returns boolean of this request is in webSocket.
 func (input *BeegoInput) IsWebsocket() bool {
 	return input.Header("Upgrade") == "websocket"
 }
 
+// IsSecure returns boolean of whether file uploads in this request or not..
 func (input *BeegoInput) IsUpload() bool {
 	return input.Request.MultipartForm != nil
 }
 
+// IP returns request client ip.
+// if in proxy, return first proxy id.
+// if error, return 127.0.0.1.
 func (input *BeegoInput) IP() string {
 	ips := input.Proxy()
 	if len(ips) > 0 && ips[0] != "" {
@@ -98,13 +119,14 @@ func (input *BeegoInput) IP() string {
 	}
 	ip := strings.Split(input.Request.RemoteAddr, ":")
 	if len(ip) > 0 {
-		if ip[0] != "["{
+		if ip[0] != "[" {
 			return ip[0]
 		}
 	}
 	return "127.0.0.1"
 }
 
+// Proxy returns proxy client ips slice.
 func (input *BeegoInput) Proxy() []string {
 	if ips := input.Header("X-Forwarded-For"); ips != "" {
 		return strings.Split(ips, ",")
@@ -112,15 +134,20 @@ func (input *BeegoInput) Proxy() []string {
 	return []string{}
 }
 
+// Refer returns http referer header.
 func (input *BeegoInput) Refer() string {
 	return input.Header("Referer")
 }
 
+// SubDomains returns sub domain string.
+// if aa.bb.domain.com, returns aa.bb .
 func (input *BeegoInput) SubDomains() string {
 	parts := strings.Split(input.Host(), ".")
 	return strings.Join(parts[len(parts)-2:], ".")
 }
 
+// Port returns request client port.
+// when error or empty, return 80.
 func (input *BeegoInput) Port() int {
 	parts := strings.Split(input.Request.Host, ":")
 	if len(parts) == 2 {
@@ -130,10 +157,12 @@ func (input *BeegoInput) Port() int {
 	return 80
 }
 
+// UserAgent returns request client user agent string.
 func (input *BeegoInput) UserAgent() string {
 	return input.Header("User-Agent")
 }
 
+// Param returns router param by a given key.
 func (input *BeegoInput) Param(key string) string {
 	if v, ok := input.Params[key]; ok {
 		return v
@@ -141,15 +170,19 @@ func (input *BeegoInput) Param(key string) string {
 	return ""
 }
 
+// Query returns input data item string by a given string.
 func (input *BeegoInput) Query(key string) string {
 	input.Request.ParseForm()
 	return input.Request.Form.Get(key)
 }
 
+// Header returns request header item string by a given string.
 func (input *BeegoInput) Header(key string) string {
 	return input.Request.Header.Get(key)
 }
 
+// Cookie returns request cookie item string by a given key.
+// if non-existed, return empty string.
 func (input *BeegoInput) Cookie(key string) string {
 	ck, err := input.Request.Cookie(key)
 	if err != nil {
@@ -158,10 +191,12 @@ func (input *BeegoInput) Cookie(key string) string {
 	return ck.Value
 }
 
+// Session returns current session item value by a given key.
 func (input *BeegoInput) Session(key interface{}) interface{} {
 	return input.CruSession.Get(key)
 }
 
+// Body returns the raw request body data as bytes.
 func (input *BeegoInput) Body() []byte {
 	requestbody, _ := ioutil.ReadAll(input.Request.Body)
 	input.Request.Body.Close()
@@ -171,6 +206,7 @@ func (input *BeegoInput) Body() []byte {
 	return requestbody
 }
 
+// GetData returns the stored data in this context.
 func (input *BeegoInput) GetData(key interface{}) interface{} {
 	if v, ok := input.Data[key]; ok {
 		return v
@@ -178,6 +214,8 @@ func (input *BeegoInput) GetData(key interface{}) interface{} {
 	return nil
 }
 
+// SetData stores data with given key in this context.
+// This data are only available in this context.
 func (input *BeegoInput) SetData(key, val interface{}) {
 	input.Data[key] = val
 }
diff --git a/context/output.go b/context/output.go
index 60e04ebe..43948e15 100644
--- a/context/output.go
+++ b/context/output.go
@@ -17,20 +17,27 @@ import (
 	"strings"
 )
 
+// BeegoOutput does work for sending response header.
 type BeegoOutput struct {
 	Context    *Context
 	Status     int
 	EnableGzip bool
 }
 
+// NewOutput returns new BeegoOutput.
+// it contains nothing now.
 func NewOutput() *BeegoOutput {
 	return &BeegoOutput{}
 }
 
+// Header sets response header item string via given key.
 func (output *BeegoOutput) Header(key, val string) {
 	output.Context.ResponseWriter.Header().Set(key, val)
 }
 
+// Body sets response body content.
+// if EnableGzip, compress content string.
+// it sends out response body directly.
 func (output *BeegoOutput) Body(content []byte) {
 	output_writer := output.Context.ResponseWriter.(io.Writer)
 	if output.EnableGzip == true && output.Context.Input.Header("Accept-Encoding") != "" {
@@ -64,6 +71,8 @@ func (output *BeegoOutput) Body(content []byte) {
 	}
 }
 
+// Cookie sets cookie value via given key.
+// others are ordered as cookie's max age time, path,domain, secure and httponly.
 func (output *BeegoOutput) Cookie(name string, value string, others ...interface{}) {
 	var b bytes.Buffer
 	fmt.Fprintf(&b, "%s=%s", sanitizeName(name), sanitizeValue(value))
@@ -116,6 +125,8 @@ func sanitizeValue(v string) string {
 	return cookieValueSanitizer.Replace(v)
 }
 
+// Json writes json to response body.
+// if coding is true, it converts utf-8 to \u0000 type.
 func (output *BeegoOutput) Json(data interface{}, hasIndent bool, coding bool) error {
 	output.Header("Content-Type", "application/json;charset=UTF-8")
 	var content []byte
@@ -136,6 +147,7 @@ func (output *BeegoOutput) Json(data interface{}, hasIndent bool, coding bool) e
 	return nil
 }
 
+// Jsonp writes jsonp to response body.
 func (output *BeegoOutput) Jsonp(data interface{}, hasIndent bool) error {
 	output.Header("Content-Type", "application/javascript;charset=UTF-8")
 	var content []byte
@@ -161,6 +173,7 @@ func (output *BeegoOutput) Jsonp(data interface{}, hasIndent bool) error {
 	return nil
 }
 
+// Xml writes xml string to response body.
 func (output *BeegoOutput) Xml(data interface{}, hasIndent bool) error {
 	output.Header("Content-Type", "application/xml;charset=UTF-8")
 	var content []byte
@@ -178,6 +191,8 @@ func (output *BeegoOutput) Xml(data interface{}, hasIndent bool) error {
 	return nil
 }
 
+// Download forces response for download file.
+// it prepares the download response header automatically.
 func (output *BeegoOutput) Download(file string) {
 	output.Header("Content-Description", "File Transfer")
 	output.Header("Content-Type", "application/octet-stream")
@@ -189,6 +204,8 @@ func (output *BeegoOutput) Download(file string) {
 	http.ServeFile(output.Context.ResponseWriter, output.Context.Request, file)
 }
 
+// ContentType sets the content type from ext string.
+// MIME type is given in mime package.
 func (output *BeegoOutput) ContentType(ext string) {
 	if !strings.HasPrefix(ext, ".") {
 		ext = "." + ext
@@ -199,43 +216,63 @@ func (output *BeegoOutput) ContentType(ext string) {
 	}
 }
 
+// SetStatus sets response status code.
+// It writes response header directly.
 func (output *BeegoOutput) SetStatus(status int) {
 	output.Context.ResponseWriter.WriteHeader(status)
 	output.Status = status
 }
 
+// IsCachable returns boolean of this request is cached.
+// HTTP 304 means cached.
 func (output *BeegoOutput) IsCachable(status int) bool {
 	return output.Status >= 200 && output.Status < 300 || output.Status == 304
 }
 
+// IsEmpty returns boolean of this request is empty.
+// HTTP 201，204 and 304 means empty.
 func (output *BeegoOutput) IsEmpty(status int) bool {
 	return output.Status == 201 || output.Status == 204 || output.Status == 304
 }
 
+// IsOk returns boolean of this request runs well.
+// HTTP 200 means ok.
 func (output *BeegoOutput) IsOk(status int) bool {
 	return output.Status == 200
 }
 
+// IsSuccessful returns boolean of this request runs successfully.
+// HTTP 2xx means ok.
 func (output *BeegoOutput) IsSuccessful(status int) bool {
 	return output.Status >= 200 && output.Status < 300
 }
 
+// IsRedirect returns boolean of this request is redirection header.
+// HTTP 301,302,307 means redirection.
 func (output *BeegoOutput) IsRedirect(status int) bool {
 	return output.Status == 301 || output.Status == 302 || output.Status == 303 || output.Status == 307
 }
 
+// IsForbidden returns boolean of this request is forbidden.
+// HTTP 403 means forbidden.
 func (output *BeegoOutput) IsForbidden(status int) bool {
 	return output.Status == 403
 }
 
+// IsNotFound returns boolean of this request is not found.
+// HTTP 404 means forbidden.
 func (output *BeegoOutput) IsNotFound(status int) bool {
 	return output.Status == 404
 }
 
+// IsClient returns boolean of this request client sends error data.
+// HTTP 4xx means forbidden.
 func (output *BeegoOutput) IsClientError(status int) bool {
 	return output.Status >= 400 && output.Status < 500
 }
 
+// IsServerError returns boolean of this server handler errors.
+// HTTP 5xx means server internal error.
 func (output *BeegoOutput) IsServerError(status int) bool {
 	return output.Status >= 500 && output.Status < 600
 }
@@ -254,6 +291,7 @@ func stringsToJson(str string) string {
 	return jsons
 }
 
+// Sessions sets session item value with given key.
 func (output *BeegoOutput) Session(name interface{}, value interface{}) {
 	output.Context.Input.CruSession.Set(name, value)
 }