diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..dee76c5
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,5 @@
+module XProxy
+
+go 1.18
+
+require gopkg.in/yaml.v3 v3.0.1 // indirect
diff --git a/go.sum b/go.sum
new file mode 100644
index 0000000..4bc0337
--- /dev/null
+++ b/go.sum
@@ -0,0 +1,3 @@
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
diff --git a/src/config.go b/src/config.go
new file mode 100644
index 0000000..d36dd81
--- /dev/null
+++ b/src/config.go
@@ -0,0 +1,66 @@
+package main
+
+import (
+    "fmt"
+    "gopkg.in/yaml.v3"
+    "net"
+    "strconv"
+    "strings"
+)
+
+type netConfig struct {
+    Gateway string `yaml:"gateway"` // network gateway
+    Address string `yaml:"address"` // network address
+    Forward bool   `yaml:"forward"` // enabled net forward
+}
+
+type Config struct {
+    Network struct {
+        DNS    []string  `yaml:"dns"`    // system dns server
+        ByPass []string  `yaml:"bypass"` // cidr bypass list
+        IPv4   netConfig `yaml:"ipv4"`   // ipv4 network configure
+        IPv6   netConfig `yaml:"ipv6"`   // ipv6 network configure
+    }
+}
+
+func isIP(ipAddr string, isRange bool, allowEmpty bool, ipLength int, ipFlag string) bool {
+    var address string
+    if allowEmpty && ipAddr == "" { // empty case
+        return true
+    }
+    if isRange {
+        temp := strings.Split(ipAddr, "/")
+        if len(temp) != 2 { // not {IP_ADDRESS}/{LENGTH} format
+            return false
+        }
+        length, err := strconv.Atoi(temp[1])
+        if err != nil { // range length not a integer
+            return false
+        }
+        if length < 0 || length > ipLength { // length should between 0 ~ ipLength
+            return false
+        }
+        address = temp[0]
+    } else {
+        address = ipAddr
+    }
+    ip := net.ParseIP(address) // try to convert ip
+    return ip != nil && strings.Contains(address, ipFlag)
+}
+
+func isIPv4(ipAddr string, isRange bool, allowEmpty bool) bool {
+    return isIP(ipAddr, isRange, allowEmpty, 32, ".")
+}
+
+func isIPv6(ipAddr string, isRange bool, allowEmpty bool) bool {
+    return isIP(ipAddr, isRange, allowEmpty, 128, ":")
+}
+
+func loadConfig(rawConfig []byte) {
+    config := Config{}
+    err := yaml.Unmarshal(rawConfig, &config) // yaml (or json) decode
+    if err != nil {
+        panic(err)
+    }
+    fmt.Println(config)
+}
diff --git a/src/main.go b/src/main.go
index 250fddf..e27dedb 100644
--- a/src/main.go
+++ b/src/main.go
@@ -2,52 +2,27 @@ package main
 
 import (
     "fmt"
-    "net"
-    "strconv"
-    "strings"
 )
 
-func isIP(ipAddr string, isRange bool, allowEmpty bool, ipLength int, ipFlag string) bool {
-    var address string
-    if allowEmpty && ipAddr == "" { // empty case
-        return true
-    }
-    if isRange {
-        temp := strings.Split(ipAddr, "/")
-        if len(temp) != 2 { // not {IP_ADDRESS}/{LENGTH} format
-            return false
-        }
-        length, err := strconv.Atoi(temp[1])
-        if err != nil { // range length not a integer
-            return false
-        }
-        if length < 0 || length > ipLength { // length should between 0 ~ ipLength
-            return false
-        }
-        address = temp[0]
-    } else {
-        address = ipAddr
-    }
-    ip := net.ParseIP(address) // try to convert ip
-    return ip != nil && strings.Contains(address, ipFlag)
-}
-
-func isIPv4(ipAddr string, isRange bool, allowEmpty bool) bool {
-    return isIP(ipAddr, isRange, allowEmpty, 32, ".")
-}
-
-func isIPv6(ipAddr string, isRange bool, allowEmpty bool) bool {
-    return isIP(ipAddr, isRange, allowEmpty, 128, ":")
-}
-
 func main() {
-    fmt.Println("XProxy")
+    fmt.Println("XProxy start")
+
+    yamlContent := []byte(`
+network:
+  dns:  # system's dns server
+    - 223.5.5.5
+    - 119.29.29.29
+#    - fesdc.fardf.afa
+  ipv4:  # ipv4 network configure
+    gateway: 192.168.2.1
+    address: 192.168.2.2/24
+    forward: false
+  ipv6: null
+  bypass:
+    - 169.254.0.0/16
+    - fc00::/7
+    - 224.0.0.0/3
+`)
 
-    fmt.Println(isIPv4("1.1.1.1", false, false))
-    fmt.Println(isIPv4("1.1.1.1/24", true, false))
-    fmt.Println(isIPv4("", true, true))
-    fmt.Println(isIPv4("::1", true, true))
-    fmt.Println(isIPv6("::1", true, true))
-    fmt.Println(isIPv6("::1/32", true, true))
-    fmt.Println(isIPv6("::1", true, true))
+    loadConfig(yamlContent)
 }