diff --git a/client/client.go b/client/client.go
index 46b544b..082efb4 100644
--- a/client/client.go
+++ b/client/client.go
@@ -6,6 +6,7 @@ import (
 	"io"
 	"net"
 	"sync"
+	"bufio"
 )
 
 // One client connect to one server.
@@ -19,6 +20,7 @@ type Client struct {
 	in                  chan *Response
 	isConn              bool
 	conn                net.Conn
+	rw					*bufio.ReadWriter
 
 	ErrorHandler ErrorHandler
 }
@@ -36,6 +38,8 @@ func New(network, addr string) (client *Client, err error) {
 	if err != nil {
 		return
 	}
+	client.rw = bufio.NewReadWriter(bufio.NewReader(client.conn),
+		bufio.NewWriter(client.conn))
 	client.isConn = true
 	go client.readLoop()
 	go client.processLoop()
@@ -46,12 +50,12 @@ func (client *Client) write(req *request) (err error) {
 	var n int
 	buf := req.Encode()
 	for i := 0; i < len(buf); i += n {
-		n, err = client.conn.Write(buf[i:])
+		n, err = client.rw.Write(buf[i:])
 		if err != nil {
 			return
 		}
 	}
-	return
+	return client.rw.Flush()
 }
 
 func (client *Client) read(length int) (data []byte, err error) {
@@ -59,7 +63,7 @@ func (client *Client) read(length int) (data []byte, err error) {
 	buf := getBuffer(bufferSize)
 	// read until data can be unpacked
 	for i := length; i > 0 || len(data) < minPacketLength; i -= n {
-		if n, err = client.conn.Read(buf); err != nil {
+		if n, err = client.rw.Read(buf); err != nil {
 			if err == io.EOF {
 				err = ErrLostConn
 			}
@@ -78,6 +82,7 @@ func (client *Client) readLoop() {
 	var data, leftdata []byte
 	var err error
 	var resp *Response
+ReadLoop:
 	for {
 		if data, err = client.read(bufferSize); err != nil {
 			client.err(err)
@@ -93,24 +98,30 @@ func (client *Client) readLoop() {
 				client.err(err)
 				break
 			}
+			client.rw = bufio.NewReadWriter(bufio.NewReader(client.conn),
+				bufio.NewWriter(client.conn))
 			continue
 		}
 		if len(leftdata) > 0 { // some data left for processing
 			data = append(leftdata, data...)
 		}
-		l := len(data)
-		if l < minPacketLength { // not enough data
-			leftdata = data
-			continue
-		}
-		if resp, l, err = decodeResponse(data); err != nil {
-			client.err(err)
-			continue
-		}
-		client.in <- resp
-		leftdata = nil
-		if len(data) > l {
-			leftdata = data[l:]
+		for {
+			l := len(data)
+			if l < minPacketLength { // not enough data
+				leftdata = data
+				continue ReadLoop
+			}
+			if resp, l, err = decodeResponse(data); err != nil {
+				leftdata = data[l:]
+				continue ReadLoop
+			} else {
+				client.in <- resp
+			}
+			data = data[l:]
+			if len(data) > 0 {
+				continue
+			}
+			break
 		}
 	}
 }
@@ -131,9 +142,13 @@ func (client *Client) processLoop() {
 			resp = client.handleInner("c", resp)
 		case dtEchoRes:
 			resp = client.handleInner("e", resp)
-		case dtWorkData, dtWorkWarning, dtWorkStatus, dtWorkComplete,
-			dtWorkFail, dtWorkException:
+		case dtWorkData, dtWorkWarning, dtWorkStatus:
 			resp = client.handleResponse(resp.Handle, resp)
+		case dtWorkComplete, dtWorkFail, dtWorkException:
+			resp = client.handleResponse(resp.Handle, resp)
+			if resp != nil {
+				delete(client.respHandler, resp.Handle)
+			}
 		}
 	}
 }
@@ -147,7 +162,6 @@ func (client *Client) err(e error) {
 func (client *Client) handleResponse(key string, resp *Response) *Response {
 	if h, ok := client.respHandler[key]; ok {
 		h(resp)
-		delete(client.respHandler, key)
 		return nil
 	}
 	return resp
@@ -227,7 +241,7 @@ func (client *Client) Status(handle string) (status *Status, err error) {
 	client.lastcall = "s" + handle
 	client.innerHandler["s"+handle] = func(resp *Response) {
 		var err error
-		status, err = resp.Status()
+		status, err = resp._status()
 		if err != nil {
 			client.err(err)
 		}
diff --git a/client/common.go b/client/common.go
index b011662..89ec4c4 100644
--- a/client/common.go
+++ b/client/common.go
@@ -49,19 +49,22 @@ const (
 	dtSubmitJobHighBg = 32
 	dtSubmitJobLow    = 33
 	dtSubmitJobLowBg  = 34
+
+	WorkComplate =	dtWorkComplete
+	WorkDate = dtWorkData
+	WorkStatus = dtWorkStatus
+	WorkWarning = dtWorkWarning
+	WorkFail = dtWorkFail
+	WorkException = dtWorkException
 )
 
 const (
 	// Job type
-	// JOB_NORMAL | JOB_BG means a normal level job run in background
-	// normal level
-	JobNormal = 0
-	// background job
-	JobBg = 1
+	JobNormal = iota
 	// low level
-	JobLow = 2
+	JobLow
 	// high level
-	JobHigh = 4
+	JobHigh
 )
 
 func getBuffer(l int) (buf []byte) {
diff --git a/client/response.go b/client/response.go
index 3903ab7..c215cb1 100644
--- a/client/response.go
+++ b/client/response.go
@@ -32,13 +32,7 @@ func (resp *Response) Result() (data []byte, err error) {
 		err = ErrWorkException
 		fallthrough
 	case dtWorkComplete:
-		s := bytes.SplitN(resp.Data, []byte{'\x00'}, 2)
-		if len(s) != 2 {
-			err = fmt.Errorf("Invalid data: %V", resp.Data)
-			return
-		}
-		resp.Handle = string(s[0])
-		data = s[1]
+		data = resp.Data
 	default:
 		err = ErrDataType
 	}
@@ -52,26 +46,25 @@ func (resp *Response) Update() (data []byte, err error) {
 		err = ErrDataType
 		return
 	}
-	s := bytes.SplitN(resp.Data, []byte{'\x00'}, 2)
-	if len(s) != 2 {
-		err = ErrInvalidData
-		return
-	}
+	data = resp.Data
 	if resp.DataType == dtWorkWarning {
 		err = ErrWorkWarning
 	}
-	resp.Handle = string(s[0])
-	data = s[1]
 	return
 }
 
 // Decode a job from byte slice
 func decodeResponse(data []byte) (resp *Response, l int, err error) {
-	if len(data) < minPacketLength { // valid package should not less 12 bytes
+	a := len(data)
+	if a < minPacketLength { // valid package should not less 12 bytes
 		err = fmt.Errorf("Invalid data: %V", data)
 		return
 	}
 	dl := int(binary.BigEndian.Uint32(data[8:12]))
+	if a < minPacketLength + dl {
+		err = fmt.Errorf("Invalid data: %V", data)
+		return
+	}
 	dt := data[minPacketLength : dl+minPacketLength]
 	if len(dt) != int(dl) { // length not equal
 		err = fmt.Errorf("Invalid data: %V", data)
@@ -101,8 +94,31 @@ func decodeResponse(data []byte) (resp *Response, l int, err error) {
 	return
 }
 
-// status handler
 func (resp *Response) Status() (status *Status, err error) {
+	data := bytes.SplitN(resp.Data, []byte{'\x00'}, 2)
+	if len(data) != 2 {
+		err = fmt.Errorf("Invalid data: %V", resp.Data)
+		return
+	}
+	status = &Status{}
+	status.Handle = resp.Handle
+	status.Known = true
+	status.Running = true
+	status.Numerator, err = strconv.ParseUint(string(data[0]), 10, 0)
+	if err != nil {
+		err = fmt.Errorf("Invalid Integer: %s", data[0])
+		return
+	}
+	status.Denominator, err = strconv.ParseUint(string(data[1]), 10, 0)
+	if err != nil {
+		err = fmt.Errorf("Invalid Integer: %s", data[1])
+		return
+	}
+	return
+}
+
+// status handler
+func (resp *Response) _status() (status *Status, err error) {
 	data := bytes.SplitN(resp.Data, []byte{'\x00'}, 4)
 	if len(data) != 4 {
 		err = fmt.Errorf("Invalid data: %V", resp.Data)
diff --git a/worker/agent.go b/worker/agent.go
index 76fbbde..241b88a 100644
--- a/worker/agent.go
+++ b/worker/agent.go
@@ -5,12 +5,14 @@ import (
 	"net"
 	"strings"
 	"sync"
+	"bufio"
 )
 
 // The agent of job server.
 type agent struct {
 	sync.Mutex
 	conn      net.Conn
+	rw		*bufio.ReadWriter
 	worker    *Worker
 	in        chan []byte
 	net, addr string
@@ -34,6 +36,8 @@ func (a *agent) Connect() (err error) {
 	if err != nil {
 		return
 	}
+	a.rw = bufio.NewReadWriter(bufio.NewReader(a.conn),
+		bufio.NewWriter(a.conn))
 	go a.work()
 	return
 }
@@ -58,6 +62,8 @@ func (a *agent) work() {
 				a.worker.err(err)
 				break
 			}
+			a.rw = bufio.NewReadWriter(bufio.NewReader(a.conn),
+				bufio.NewWriter(a.conn))
 		}
 		if len(leftdata) > 0 { // some data left for processing
 			data = append(leftdata, data...)
@@ -120,7 +126,7 @@ func (a *agent) read(length int) (data []byte, err error) {
 	buf := getBuffer(bufferSize)
 	// read until data can be unpacked
 	for i := length; i > 0 || len(data) < minPacketLength; i -= n {
-		if n, err = a.conn.Read(buf); err != nil {
+		if n, err = a.rw.Read(buf); err != nil {
 			if isClosed(err) {
 				err = ErrLostConn
 			}
@@ -139,10 +145,10 @@ func (a *agent) write(outpack *outPack) (err error) {
 	var n int
 	buf := outpack.Encode()
 	for i := 0; i < len(buf); i += n {
-		n, err = a.conn.Write(buf[i:])
+		n, err = a.rw.Write(buf[i:])
 		if err != nil {
 			return err
 		}
 	}
-	return
+	return a.rw.Flush()
 }