diff --git a/common/collect/string_list.go b/common/collect/string_list.go
deleted file mode 100644
index 528c213e94..0000000000
--- a/common/collect/string_list.go
+++ /dev/null
@@ -1,12 +0,0 @@
-package collect
-
-type StringList []string
-
-func NewStringList(raw []string) *StringList {
-	list := StringList(raw)
-	return &list
-}
-
-func (this StringList) Len() int {
-	return len(this)
-}
diff --git a/common/collect/string_list_json.go b/common/collect/string_list_json.go
deleted file mode 100644
index 0233bef2d4..0000000000
--- a/common/collect/string_list_json.go
+++ /dev/null
@@ -1,25 +0,0 @@
-// +build json
-
-package collect
-
-import (
-	"encoding/json"
-	"errors"
-	"strings"
-)
-
-func (this *StringList) UnmarshalJSON(data []byte) error {
-	var strarray []string
-	if err := json.Unmarshal(data, &strarray); err == nil {
-		*this = *NewStringList(strarray)
-		return nil
-	}
-
-	var rawstr string
-	if err := json.Unmarshal(data, &rawstr); err == nil {
-		strlist := strings.Split(rawstr, ",")
-		*this = *NewStringList(strlist)
-		return nil
-	}
-	return errors.New("Unknown format of a string list: " + string(data))
-}
diff --git a/common/collect/string_list_json_test.go b/common/collect/string_list_json_test.go
deleted file mode 100644
index 82b02aac1d..0000000000
--- a/common/collect/string_list_json_test.go
+++ /dev/null
@@ -1,30 +0,0 @@
-// +build json
-
-package collect_test
-
-import (
-	"encoding/json"
-	"testing"
-
-	. "v2ray.com/core/common/collect"
-	"v2ray.com/core/testing/assert"
-)
-
-func TestStringListUnmarshalError(t *testing.T) {
-	assert := assert.On(t)
-
-	rawJson := `1234`
-	list := new(StringList)
-	err := json.Unmarshal([]byte(rawJson), list)
-	assert.Error(err).IsNotNil()
-}
-
-func TestStringListLen(t *testing.T) {
-	assert := assert.On(t)
-
-	rawJson := `"a, b, c, d"`
-	list := new(StringList)
-	err := json.Unmarshal([]byte(rawJson), list)
-	assert.Error(err).IsNil()
-	assert.Int(list.Len()).Equals(4)
-}
diff --git a/common/net/network.go b/common/net/network.go
index 8d13c23304..4afd615443 100644
--- a/common/net/network.go
+++ b/common/net/network.go
@@ -2,8 +2,6 @@ package net
 
 import (
 	"strings"
-
-	"v2ray.com/core/common/collect"
 )
 
 func ParseNetwork(nwStr string) Network {
@@ -56,17 +54,6 @@ func (this Network) UrlPrefix() string {
 	}
 }
 
-// NewNetworkList construsts a NetWorklist from the given StringListeralList.
-func NewNetworkList(networks collect.StringList) *NetworkList {
-	list := &NetworkList{
-		Network: make([]Network, networks.Len()),
-	}
-	for idx, network := range networks {
-		list.Network[idx] = ParseNetwork(network)
-	}
-	return list
-}
-
 // HashNetwork returns true if the given network is in this NetworkList.
 func (this NetworkList) HasNetwork(network Network) bool {
 	for _, value := range this.Network {
diff --git a/common/net/network_json.go b/common/net/network_json.go
deleted file mode 100644
index 93e9947653..0000000000
--- a/common/net/network_json.go
+++ /dev/null
@@ -1,27 +0,0 @@
-// +build json
-
-package net
-
-import (
-	"encoding/json"
-
-	"v2ray.com/core/common/collect"
-)
-
-func (this *Network) UnmarshalJSON(data []byte) error {
-	var str string
-	if err := json.Unmarshal(data, &str); err != nil {
-		return err
-	}
-	*this = ParseNetwork(str)
-	return nil
-}
-
-func (this *NetworkList) UnmarshalJSON(data []byte) error {
-	var strlist collect.StringList
-	if err := json.Unmarshal(data, &strlist); err != nil {
-		return err
-	}
-	*this = *NewNetworkList(strlist)
-	return nil
-}
diff --git a/common/net/network_json_test.go b/common/net/network_json_test.go
deleted file mode 100644
index 2bcbd6ecb9..0000000000
--- a/common/net/network_json_test.go
+++ /dev/null
@@ -1,48 +0,0 @@
-// +build json
-
-package net_test
-
-import (
-	"encoding/json"
-	"testing"
-
-	. "v2ray.com/core/common/net"
-	"v2ray.com/core/testing/assert"
-)
-
-func TestStringNetwork(t *testing.T) {
-	assert := assert.On(t)
-
-	var network Network
-	err := json.Unmarshal([]byte(`"tcp"`), &network)
-	assert.Error(err).IsNil()
-	assert.Bool(network == Network_TCP).IsTrue()
-}
-
-func TestArrayNetworkList(t *testing.T) {
-	assert := assert.On(t)
-
-	var list NetworkList
-	err := json.Unmarshal([]byte("[\"Tcp\"]"), &list)
-	assert.Error(err).IsNil()
-	assert.Bool(list.HasNetwork(ParseNetwork("tcp"))).IsTrue()
-	assert.Bool(list.HasNetwork(ParseNetwork("udp"))).IsFalse()
-}
-
-func TestStringNetworkList(t *testing.T) {
-	assert := assert.On(t)
-
-	var list NetworkList
-	err := json.Unmarshal([]byte("\"TCP, ip\""), &list)
-	assert.Error(err).IsNil()
-	assert.Bool(list.HasNetwork(ParseNetwork("tcp"))).IsTrue()
-	assert.Bool(list.HasNetwork(ParseNetwork("udp"))).IsFalse()
-}
-
-func TestInvalidNetworkJson(t *testing.T) {
-	assert := assert.On(t)
-
-	var list NetworkList
-	err := json.Unmarshal([]byte("0"), &list)
-	assert.Error(err).IsNotNil()
-}