diff --git a/hosts/hosts.go b/hosts/hosts.go
index 8df73ff..d3960bb 100644
--- a/hosts/hosts.go
+++ b/hosts/hosts.go
@@ -1,213 +1,442 @@
 package hosts
 
 import (
-	"bytes"
-	"io/ioutil"
+	"bufio"
+	"fmt"
+	"io"
+	"net"
+	"os"
 	"runtime"
+	"strings"
 	"sync"
-
-	"b612.me/staros/sysconf"
 )
 
-var hostsPath string
-var hostsCfg *sysconf.SysConf
-var haveError error
-var lock sync.Mutex
-var reverse bool = false
-
-func init() {
+func SystemHostpath() string {
 	if runtime.GOOS == "windows" {
-		hostsPath = `C:\Windows\System32\drivers\etc\hosts`
-	} else {
-		hostsPath = `/etc/hosts`
+		return `C:\Windows\System32\drivers\etc\hosts`
 	}
+	return `/etc/hosts`
 }
 
-func SetHostsPath(path string) {
-	hostsPath = path
+type HostNode struct {
+	uid         uint64
+	nextuid     uint64
+	lastuid     uint64
+	IP          string
+	Host        []string
+	Comment     string
+	Original    string
+	OnlyComment bool
+	Valid       bool
 }
-
-func GetHostsPath() string {
-	return hostsPath
+type Host struct {
+	idx      uint64
+	hostPath string
+	nextUid  uint64
+	lastUid  uint64
+	fulldata map[uint64]*HostNode
+	hostData map[string][]*HostNode
+	ipData   map[string][]*HostNode
+	sync.RWMutex
 }
 
-func Parse() error {
-	hostsCfg = new(sysconf.SysConf)
-	hostsCfg.EqualFlag = ` `
-	hostsCfg.HaveSegMent = false
-	hostsCfg.CommentCR = true
-	hostsCfg.CommentFlag = []string{"#"}
-	data, haveError := ioutil.ReadFile(hostsPath)
-	if haveError != nil {
-		return haveError
+func NewHosts() *Host {
+	return &Host{
+		hostData: make(map[string][]*HostNode),
+		ipData:   make(map[string][]*HostNode),
+		fulldata: make(map[uint64]*HostNode),
 	}
-	data = bytes.ReplaceAll(data, []byte(`	`), []byte(" "))
-	haveError = hostsCfg.Parse(data)
-	return haveError
 }
 
-func GetIpByDomain(domainName string) []string {
-	if haveError != nil {
-		return []string{}
+func (h *Host) Parse(hostPath string) error {
+	h.Lock()
+	defer h.Unlock()
+	h.hostPath = hostPath
+	h.fulldata = make(map[uint64]*HostNode)
+	h.hostData = make(map[string][]*HostNode)
+	h.ipData = make(map[string][]*HostNode)
+	return h.parse()
+}
+
+func (h *Host) parse() error {
+	f, err := os.OpenFile(h.hostPath, os.O_RDONLY, 0666)
+	if err != nil {
+		return fmt.Errorf("open hosts file %s error: %s", h.hostPath, err)
 	}
-	lock.Lock()
-	defer lock.Unlock()
-	if !reverse {
-		hostsCfg.Reverse()
-		reverse = !reverse
+	defer f.Close()
+	buf := bufio.NewReader(f)
+	for {
+		line, err := buf.ReadString('\n')
+		if err == io.EOF {
+			if h.idx-1 >= 0 {
+				h.fulldata[h.idx].nextuid = 0
+				h.lastUid = h.idx
+			}
+			break
+		}
+		if err != nil {
+			return fmt.Errorf("read hosts file error: %s", err)
+		}
+		h.idx++
+		line = strings.TrimSpace(line)
+		data, _ := h.parseLine(line)
+		data.uid = h.idx
+		data.lastuid = h.idx - 1
+		data.nextuid = h.idx + 1
+		h.fulldata[data.uid] = &data
+		if h.nextUid == 0 {
+			h.nextUid = h.idx
+		}
+		if data.Valid {
+			for _, v := range data.Host {
+				h.hostData[v] = append(h.hostData[v], &data)
+			}
+			h.ipData[data.IP] = append(h.ipData[data.IP], &data)
+		}
 	}
-	return hostsCfg.Data[0].GetAll(domainName)
+
+	return nil
 }
 
-func GetDomainByIp(IpAddr string) []string {
-	if haveError != nil {
-		return []string{}
+func (h *Host) parseLine(data string) (HostNode, error) {
+	var res = HostNode{
+		Original: data,
+	}
+	if len(data) == 0 {
+		return res, fmt.Errorf("empty line")
 	}
-	lock.Lock()
-	defer lock.Unlock()
-	if reverse {
-		hostsCfg.Reverse()
-		reverse = !reverse
+	if data[0] == '#' {
+		res.Comment = data
+		res.OnlyComment = true
+		return res, nil
+	}
+	var dataArr []string
+	cache := ""
+	for k, v := range data {
+		if v == '#' {
+			if len(cache) > 0 {
+				dataArr = append(dataArr, cache)
+				cache = ""
+			}
+			dataArr = append(dataArr, data[k:])
+			break
+		}
+		if v == ' ' || v == '\t' {
+			if len(cache) > 0 {
+				dataArr = append(dataArr, cache)
+				cache = ""
+			}
+			continue
+		}
+		cache += string(v)
 	}
-	return hostsCfg.Data[0].GetAll(IpAddr)
+	if len(cache) > 0 {
+		dataArr = append(dataArr, cache)
+	}
+	if len(dataArr) < 2 {
+		return res, fmt.Errorf("invalid line")
+	}
+	if strings.HasPrefix(dataArr[1], "#") {
+		return res, fmt.Errorf("invalid line")
+	}
+	if net.ParseIP(dataArr[0]) == nil {
+		return res, fmt.Errorf("invalid ip address")
+	}
+	for k, v := range dataArr {
+		switch k {
+		case 0:
+			res.IP = v
+		default:
+			if strings.HasPrefix(v, "#") {
+				res.Comment = v
+			} else {
+				res.Host = append(res.Host, v)
+			}
+		}
+	}
+	res.Valid = true
+	return res, nil
 }
 
-func AddHosts(ip, host string) {
-	lock.Lock()
-	defer lock.Unlock()
-	if reverse {
-		hostsCfg.Data[0].AddValue(host, ip, "")
-	} else {
-		hostsCfg.Data[0].AddValue(ip, host, "")
+func (h *Host) List() []*HostNode {
+	h.RLock()
+	defer h.RUnlock()
+	var res []*HostNode
+	nextUid := h.nextUid
+	for {
+		if nextUid == 0 {
+			break
+		}
+		res = append(res, h.fulldata[nextUid])
+		nextUid = h.fulldata[nextUid].nextuid
 	}
+	return res
 }
 
-func RemoveHost(ip, host string) {
-	lock.Lock()
-	defer lock.Unlock()
-	if reverse {
-		hostsCfg.Data[0].DeleteValue(host, ip)
-	} else {
-		hostsCfg.Data[0].DeleteValue(ip, host)
+func (h *Host) ListByHost(host string) []*HostNode {
+	h.RLock()
+	defer h.RUnlock()
+	if h.hostData == nil {
+		return nil
 	}
+	return h.hostData[host]
 }
 
-func RemoveHostbyIp(ip string) {
-	lock.Lock()
-	defer lock.Unlock()
-	if reverse {
-		hostsCfg.Reverse()
-		reverse = !reverse
+func (h *Host) ListIPsByHost(host string) []string {
+	h.RLock()
+	defer h.RUnlock()
+	if h.hostData == nil {
+		return nil
+	}
+	var res []string
+	for _, v := range h.hostData[host] {
+		res = append(res, v.IP)
 	}
-	hostsCfg.Data[0].Delete(ip)
+	return res
 }
 
-func RemoveHostbyHost(host string) {
-	lock.Lock()
-	defer lock.Unlock()
-	if !reverse {
-		hostsCfg.Reverse()
-		reverse = !reverse
+func (h *Host) ListFirstIPByHost(host string) string {
+	h.RLock()
+	defer h.RUnlock()
+	if h.hostData == nil {
+		return ""
+	}
+	for _, v := range h.hostData[host] {
+		return v.IP
 	}
-	hostsCfg.Data[0].Delete(host)
+	return ""
 }
 
-// SetHost 设定唯一的Host对应值，一个host对应一个ip，其余的删除
-func SetHost(ip, host string) {
-	lock.Lock()
-	defer lock.Unlock()
-	if !reverse {
-		hostsCfg.Reverse()
-		reverse = !reverse
+func (h *Host) ListByIP(ip string) []*HostNode {
+	h.RLock()
+	defer h.RUnlock()
+	if h.ipData == nil {
+		return nil
 	}
-	hostsCfg.Data[0].Set(host, ip, "")
+	return h.ipData[ip]
+}
+
+func (h *Host) ListHostsByIP(ip string) []string {
+	h.RLock()
+	return h.listHostsByIP(ip)
 }
 
-func SetHostbyIp(ip, host string) {
-	lock.Lock()
-	defer lock.Unlock()
-	if reverse {
-		hostsCfg.Reverse()
-		reverse = !reverse
+func (h *Host) listHostsByIP(ip string) []string {
+	if h.ipData == nil {
+		return nil
+	}
+	var res []string
+	for _, v := range h.ipData[ip] {
+		res = append(res, v.Host...)
 	}
-	hostsCfg.Data[0].Set(ip, host, "")
+	return res
 }
 
-func Build() string {
-	if reverse {
-		hostsCfg.Reverse()
-		reverse = !reverse
+func (h *Host) ListFirstHostByIP(ip string) string {
+	h.RLock()
+	defer h.RUnlock()
+	if h.ipData == nil {
+		return ""
 	}
-	return string(hostsCfg.Build())
+	for _, v := range h.ipData[ip] {
+		if len(v.Host) > 0 {
+			return v.Host[0]
+		}
+	}
+	return ""
 }
 
-func Write() error {
-	lock.Lock()
-	defer lock.Unlock()
-	data := []byte(Build())
-	return ioutil.WriteFile(hostsPath, data, 0644)
+func (h *Host) AddHosts(ip string, hosts ...string) error {
+	return h.addHosts("", ip, hosts...)
 }
 
-func GetHostList() []string {
-	var res []string
-	lock.Lock()
-	defer lock.Unlock()
-	if !reverse {
-		hostsCfg.Reverse()
-		reverse = !reverse
+func (h *Host) AddHostsComment(comment string, ip string, hosts ...string) error {
+	return h.addHosts(comment, ip, hosts...)
+}
+
+func (h *Host) RemoveIPHosts(ip string, hosts ...string) error {
+	h.Lock()
+	defer h.Unlock()
+	if h.ipData == nil {
+		return fmt.Errorf("hosts data not initialized")
 	}
-	for _, v := range hostsCfg.Data[0].NodeData {
-		if v != nil {
-			res = append(res, v.Key)
+	ipInfo := h.ipData[ip]
+	if len(ipInfo) == 0 {
+		return nil
+	}
+cntfor:
+	for _, v := range ipInfo {
+		for _, host := range hosts {
+			if len(v.Host) == 1 && v.Host[0] == host {
+				delete(h.ipData, ip)
+				if v.lastuid != 0 {
+					h.fulldata[v.lastuid].nextuid = v.nextuid
+				} else {
+					h.nextUid = v.nextuid
+				}
+				if v.nextuid != 0 {
+					h.fulldata[v.nextuid].lastuid = v.lastuid
+				} else {
+					h.lastUid = v.lastuid
+				}
+				var newHostData []*HostNode
+				for _, vv := range h.hostData[v.Host[0]] {
+					if vv.uid != v.uid {
+						newHostData = append(newHostData, vv)
+					}
+				}
+				h.hostData[host] = newHostData
+				delete(h.fulldata, v.uid)
+				v = nil
+				continue cntfor
+			}
+			if len(v.Host) > 1 {
+				var newHosts []string
+				for _, vv := range v.Host {
+					if vv != host {
+						newHosts = append(newHosts, vv)
+					}
+				}
+				v.Host = newHosts
+				var newHostData []*HostNode
+				for _, vv := range h.hostData[host] {
+					if vv.uid != v.uid {
+						newHostData = append(newHostData, vv)
+					}
+				}
+				h.hostData[host] = newHostData
+			}
 		}
 	}
-	return res
+	return nil
 }
 
-func GetIpList() []string {
-	var res []string
-	lock.Lock()
-	defer lock.Unlock()
-	if reverse {
-		hostsCfg.Reverse()
-		reverse = !reverse
+func (h *Host) RemoveIPs(ips ...string) error {
+	h.Lock()
+	defer h.Unlock()
+	if h.ipData == nil {
+		return fmt.Errorf("hosts data not initialized")
 	}
-	for _, v := range hostsCfg.Data[0].NodeData {
-		if v != nil {
-			res = append(res, v.Key)
+	for _, ip := range ips {
+		ipInfo := h.ipData[ip]
+		if len(ipInfo) == 0 {
+			continue
+		}
+		for _, v := range ipInfo {
+			delete(h.ipData, ip)
+			delete(h.fulldata, v.uid)
+			if v.lastuid != 0 {
+				h.fulldata[v.lastuid].nextuid = v.nextuid
+			} else {
+				h.nextUid = v.nextuid
+			}
+			if v.nextuid != 0 {
+				h.fulldata[v.nextuid].lastuid = v.lastuid
+			} else {
+				h.lastUid = v.lastuid
+			}
+			for _, host := range v.Host {
+				var newHostData []*HostNode
+				for _, vv := range h.hostData[host] {
+					if vv.uid != v.uid {
+						newHostData = append(newHostData, vv)
+					}
+				}
+				h.hostData[host] = newHostData
+			}
 		}
 	}
-	return res
+	return nil
 }
 
-func GetAllListbyHost() map[string][]string {
-	res := make(map[string][]string)
-	lock.Lock()
-	defer lock.Unlock()
-	if !reverse {
-		hostsCfg.Reverse()
-		reverse = !reverse
+func (h *Host) RemoveHosts(hosts ...string) error {
+	h.Lock()
+	defer h.Unlock()
+	if h.hostData == nil {
+		return fmt.Errorf("hosts data not initialized")
 	}
-	for _, v := range hostsCfg.Data[0].NodeData {
-		if v != nil {
-			res[v.Key] = v.Value
+	for _, host := range hosts {
+		hostInfo := h.hostData[host]
+		if len(hostInfo) == 0 {
+			continue
+		}
+		delete(h.hostData, host)
+		for _, v := range hostInfo {
+			var newHosts []string
+			for _, vv := range v.Host {
+				if vv != host {
+					newHosts = append(newHosts, vv)
+				}
+			}
+			v.Host = newHosts
+			if len(v.Host) == 0 {
+				delete(h.ipData, v.IP)
+				if v.lastuid != 0 {
+					h.fulldata[v.lastuid].nextuid = v.nextuid
+				} else {
+					h.nextUid = v.nextuid
+				}
+				if v.nextuid != 0 {
+					h.fulldata[v.nextuid].lastuid = v.lastuid
+				} else {
+					h.lastUid = v.lastuid
+				}
+				delete(h.fulldata, v.uid)
+			}
 		}
 	}
-	return res
+	return nil
 }
 
-func GetAllListbyIp() map[string][]string {
-	res := make(map[string][]string)
-	lock.Lock()
-	defer lock.Unlock()
-	if reverse {
-		hostsCfg.Reverse()
-		reverse = !reverse
+func (h *Host) SetIPHosts(ip string, hosts ...string) error {
+	err := h.RemoveIPs(ip)
+	if err != nil {
+		return err
 	}
-	for _, v := range hostsCfg.Data[0].NodeData {
-		if v != nil {
-			res[v.Key] = v.Value
+	return h.AddHosts(ip, hosts...)
+}
+
+func (h *Host) addHosts(comment string, ip string, hosts ...string) error {
+	h.Lock()
+	defer h.Unlock()
+	if h.hostData == nil {
+		return fmt.Errorf("hosts data not initialized")
+	}
+	ipInfo := h.listHostsByIP(ip)
+	var needAddHosts []string
+	for _, v := range hosts {
+		if !inArray(ipInfo, v) {
+			needAddHosts = append(needAddHosts, v)
 		}
 	}
-	return res
+	if len(needAddHosts) == 0 {
+		return nil
+	}
+	hostNode := HostNode{
+		uid:     h.idx + 1,
+		nextuid: 0,
+		lastuid: h.lastUid,
+		IP:      ip,
+		Host:    needAddHosts,
+		Valid:   true,
+		Comment: comment,
+	}
+	h.idx++
+	h.fulldata[h.lastUid].nextuid = h.idx
+	h.lastUid = h.idx
+	h.fulldata[h.idx] = &hostNode
+	h.ipData[ip] = append(h.ipData[ip], &hostNode)
+	for _, v := range needAddHosts {
+		h.hostData[v] = append(h.hostData[v], &hostNode)
+	}
+	return nil
+}
+
+func inArray(arr []string, v string) bool {
+	for _, vv := range arr {
+		if v == vv {
+			return true
+		}
+	}
+	return false
 }
diff --git a/hosts/hosts_test.go b/hosts/hosts_test.go
index 46a3eab..80f1e2b 100644
--- a/hosts/hosts_test.go
+++ b/hosts/hosts_test.go
@@ -6,7 +6,32 @@ import (
 )
 
 func Test_Hosts(t *testing.T) {
-	//RemoveHostbyIp("192.168.222.33")
-	Parse()
-	fmt.Println(GetAllListbyIp())
+	var h = NewHosts()
+	err := h.Parse("./test_hosts.txt")
+	if err != nil {
+		t.Error(err)
+	}
+	for _, v := range h.List() {
+		fmt.Printf("%+v\n", v)
+	}
+	fmt.Println(h.nextUid, h.lastUid)
+	fmt.Println("")
+	err = h.AddHosts("122.23.12.123", "b612.me", "ok.b612.me")
+	if err != nil {
+		t.Error(err)
+	}
+	for _, v := range h.List() {
+		fmt.Printf("%+v\n", v)
+	}
+	fmt.Println(h.nextUid, h.lastUid)
+	fmt.Println("")
+	err = h.RemoveIPHosts("11.22.33.44", "remove.b612.me", "test.dns.set.b612.me")
+	if err != nil {
+		t.Error(err)
+	}
+	for _, v := range h.List() {
+		fmt.Printf("%+v\n", v)
+	}
+	fmt.Println(h.nextUid, h.lastUid)
+	fmt.Println("")
 }
diff --git a/hosts/test_hosts.txt b/hosts/test_hosts.txt
new file mode 100644
index 0000000..718a539
--- /dev/null
+++ b/hosts/test_hosts.txt
@@ -0,0 +1,22 @@
+#hosts         This file describes a number of hostname-to-address
+#mappings for the TCP/IP subsystem.  It is mostly
+#used at boot time, when no name servers are running.
+#On small systems, this file can be used instead of a
+#"named" name server.
+#Syntax:
+#IP-Address  Full-Qualifie
+#special IPv6 addre
+127.0.0.1 localhost
+127.0.0.1 b612
+#special IPv6 addresses
+::1 localhost ipv6-localhost ipv6-loopback
+fe00::0 ipv6-localnet
+ff00::0 ipv6-mcastprefix
+ff02::1 ipv6-allnodes
+ff02::2 ipv6-allrouters
+ff02::3 ipv6-allhosts
+1.2.3.4 ssh.b612.me
+4.5.6.7 dns.b612.me
+8.9.10.11 release-ftpd
+11.22.33.44 test.dns.set.b612.me  remove.b612.me
+4.5.6.7 game.b612.me