diff --git a/common/crypto/auth.go b/common/crypto/auth.go
index 355e5bc3..13866a4d 100644
--- a/common/crypto/auth.go
+++ b/common/crypto/auth.go
@@ -43,6 +43,14 @@ func GenerateInitialAEADNonce() BytesGenerator {
 	return GenerateIncreasingNonce([]byte{0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF})
 }
 
+func GenerateAEADNonceWithSize(nonceSize int) BytesGenerator {
+	c := make([]byte, nonceSize)
+	for i := 0; i < nonceSize; i++ {
+		c[i] = 0xFF
+	}
+	return GenerateIncreasingNonce(c)
+}
+
 type Authenticator interface {
 	NonceSize() int
 	Overhead() int
diff --git a/infra/conf/shadowsocks.go b/infra/conf/shadowsocks.go
index 648a7b8c..f0e778d5 100644
--- a/infra/conf/shadowsocks.go
+++ b/infra/conf/shadowsocks.go
@@ -18,6 +18,8 @@ func cipherFromString(c string) shadowsocks.CipherType {
 		return shadowsocks.CipherType_AES_256_GCM
 	case "chacha20-poly1305", "aead_chacha20_poly1305", "chacha20-ietf-poly1305":
 		return shadowsocks.CipherType_CHACHA20_POLY1305
+	case "xchacha20-poly1305", "aead_xchacha20_poly1305", "xchacha20-ietf-poly1305":
+		return shadowsocks.CipherType_XCHACHA20_POLY1305
 	case "none", "plain":
 		return shadowsocks.CipherType_NONE
 	default:
diff --git a/proxy/shadowsocks/config.go b/proxy/shadowsocks/config.go
index 3fc8eb73..9bbc7736 100644
--- a/proxy/shadowsocks/config.go
+++ b/proxy/shadowsocks/config.go
@@ -77,6 +77,12 @@ func createChaCha20Poly1305(key []byte) cipher.AEAD {
 	return ChaChaPoly1305
 }
 
+func createXChaCha20Poly1305(key []byte) cipher.AEAD {
+	XChaChaPoly1305, err := chacha20poly1305.NewX(key)
+	common.Must(err)
+	return XChaChaPoly1305
+}
+
 func (a *Account) getCipher() (Cipher, error) {
 	switch a.CipherType {
 	case CipherType_AES_128_GCM:
@@ -97,6 +103,12 @@ func (a *Account) getCipher() (Cipher, error) {
 			IVBytes:         32,
 			AEADAuthCreator: createChaCha20Poly1305,
 		}, nil
+	case CipherType_XCHACHA20_POLY1305:
+		return &AEADCipher{
+			KeyBytes:        32,
+			IVBytes:         32,
+			AEADAuthCreator: createXChaCha20Poly1305,
+		}, nil
 	case CipherType_NONE:
 		return NoneCipher{}, nil
 	default:
@@ -152,11 +164,12 @@ func (c *AEADCipher) IVSize() int32 {
 }
 
 func (c *AEADCipher) createAuthenticator(key []byte, iv []byte) *crypto.AEADAuthenticator {
-	nonce := crypto.GenerateInitialAEADNonce()
 	subkey := make([]byte, c.KeyBytes)
 	hkdfSHA1(key, iv, subkey)
+	aead := c.AEADAuthCreator(subkey)
+	nonce := crypto.GenerateAEADNonceWithSize(aead.NonceSize())
 	return &crypto.AEADAuthenticator{
-		AEAD:           c.AEADAuthCreator(subkey),
+		AEAD:           aead,
 		NonceGenerator: nonce,
 	}
 }
diff --git a/proxy/shadowsocks/config.pb.go b/proxy/shadowsocks/config.pb.go
index 8d8d9987..a70ab8f7 100644
--- a/proxy/shadowsocks/config.pb.go
+++ b/proxy/shadowsocks/config.pb.go
@@ -25,11 +25,12 @@ const (
 type CipherType int32
 
 const (
-	CipherType_UNKNOWN           CipherType = 0
-	CipherType_AES_128_GCM       CipherType = 5
-	CipherType_AES_256_GCM       CipherType = 6
-	CipherType_CHACHA20_POLY1305 CipherType = 7
-	CipherType_NONE              CipherType = 8
+	CipherType_UNKNOWN            CipherType = 0
+	CipherType_AES_128_GCM        CipherType = 5
+	CipherType_AES_256_GCM        CipherType = 6
+	CipherType_CHACHA20_POLY1305  CipherType = 7
+	CipherType_XCHACHA20_POLY1305 CipherType = 8
+	CipherType_NONE               CipherType = 9
 )
 
 // Enum value maps for CipherType.
@@ -39,14 +40,16 @@ var (
 		5: "AES_128_GCM",
 		6: "AES_256_GCM",
 		7: "CHACHA20_POLY1305",
-		8: "NONE",
+		8: "XCHACHA20_POLY1305",
+		9: "NONE",
 	}
 	CipherType_value = map[string]int32{
-		"UNKNOWN":           0,
-		"AES_128_GCM":       5,
-		"AES_256_GCM":       6,
-		"CHACHA20_POLY1305": 7,
-		"NONE":              8,
+		"UNKNOWN":            0,
+		"AES_128_GCM":        5,
+		"AES_256_GCM":        6,
+		"CHACHA20_POLY1305":  7,
+		"XCHACHA20_POLY1305": 8,
+		"NONE":               9,
 	}
 )
 
@@ -274,20 +277,22 @@ var file_proxy_shadowsocks_config_proto_rawDesc = []byte{
 	0x3c, 0x0a, 0x06, 0x73, 0x65, 0x72, 0x76, 0x65, 0x72, 0x18, 0x01, 0x20, 0x03, 0x28, 0x0b, 0x32,
 	0x24, 0x2e, 0x78, 0x72, 0x61, 0x79, 0x2e, 0x63, 0x6f, 0x6d, 0x6d, 0x6f, 0x6e, 0x2e, 0x70, 0x72,
 	0x6f, 0x74, 0x6f, 0x63, 0x6f, 0x6c, 0x2e, 0x53, 0x65, 0x72, 0x76, 0x65, 0x72, 0x45, 0x6e, 0x64,
-	0x70, 0x6f, 0x69, 0x6e, 0x74, 0x52, 0x06, 0x73, 0x65, 0x72, 0x76, 0x65, 0x72, 0x2a, 0x5c, 0x0a,
+	0x70, 0x6f, 0x69, 0x6e, 0x74, 0x52, 0x06, 0x73, 0x65, 0x72, 0x76, 0x65, 0x72, 0x2a, 0x74, 0x0a,
 	0x0a, 0x43, 0x69, 0x70, 0x68, 0x65, 0x72, 0x54, 0x79, 0x70, 0x65, 0x12, 0x0b, 0x0a, 0x07, 0x55,
 	0x4e, 0x4b, 0x4e, 0x4f, 0x57, 0x4e, 0x10, 0x00, 0x12, 0x0f, 0x0a, 0x0b, 0x41, 0x45, 0x53, 0x5f,
 	0x31, 0x32, 0x38, 0x5f, 0x47, 0x43, 0x4d, 0x10, 0x05, 0x12, 0x0f, 0x0a, 0x0b, 0x41, 0x45, 0x53,
 	0x5f, 0x32, 0x35, 0x36, 0x5f, 0x47, 0x43, 0x4d, 0x10, 0x06, 0x12, 0x15, 0x0a, 0x11, 0x43, 0x48,
 	0x41, 0x43, 0x48, 0x41, 0x32, 0x30, 0x5f, 0x50, 0x4f, 0x4c, 0x59, 0x31, 0x33, 0x30, 0x35, 0x10,
-	0x07, 0x12, 0x08, 0x0a, 0x04, 0x4e, 0x4f, 0x4e, 0x45, 0x10, 0x08, 0x42, 0x64, 0x0a, 0x1a, 0x63,
-	0x6f, 0x6d, 0x2e, 0x78, 0x72, 0x61, 0x79, 0x2e, 0x70, 0x72, 0x6f, 0x78, 0x79, 0x2e, 0x73, 0x68,
-	0x61, 0x64, 0x6f, 0x77, 0x73, 0x6f, 0x63, 0x6b, 0x73, 0x50, 0x01, 0x5a, 0x2b, 0x67, 0x69, 0x74,
-	0x68, 0x75, 0x62, 0x2e, 0x63, 0x6f, 0x6d, 0x2f, 0x78, 0x74, 0x6c, 0x73, 0x2f, 0x78, 0x72, 0x61,
-	0x79, 0x2d, 0x63, 0x6f, 0x72, 0x65, 0x2f, 0x70, 0x72, 0x6f, 0x78, 0x79, 0x2f, 0x73, 0x68, 0x61,
-	0x64, 0x6f, 0x77, 0x73, 0x6f, 0x63, 0x6b, 0x73, 0xaa, 0x02, 0x16, 0x58, 0x72, 0x61, 0x79, 0x2e,
-	0x50, 0x72, 0x6f, 0x78, 0x79, 0x2e, 0x53, 0x68, 0x61, 0x64, 0x6f, 0x77, 0x73, 0x6f, 0x63, 0x6b,
-	0x73, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
+	0x07, 0x12, 0x16, 0x0a, 0x12, 0x58, 0x43, 0x48, 0x41, 0x43, 0x48, 0x41, 0x32, 0x30, 0x5f, 0x50,
+	0x4f, 0x4c, 0x59, 0x31, 0x33, 0x30, 0x35, 0x10, 0x08, 0x12, 0x08, 0x0a, 0x04, 0x4e, 0x4f, 0x4e,
+	0x45, 0x10, 0x09, 0x42, 0x64, 0x0a, 0x1a, 0x63, 0x6f, 0x6d, 0x2e, 0x78, 0x72, 0x61, 0x79, 0x2e,
+	0x70, 0x72, 0x6f, 0x78, 0x79, 0x2e, 0x73, 0x68, 0x61, 0x64, 0x6f, 0x77, 0x73, 0x6f, 0x63, 0x6b,
+	0x73, 0x50, 0x01, 0x5a, 0x2b, 0x67, 0x69, 0x74, 0x68, 0x75, 0x62, 0x2e, 0x63, 0x6f, 0x6d, 0x2f,
+	0x78, 0x74, 0x6c, 0x73, 0x2f, 0x78, 0x72, 0x61, 0x79, 0x2d, 0x63, 0x6f, 0x72, 0x65, 0x2f, 0x70,
+	0x72, 0x6f, 0x78, 0x79, 0x2f, 0x73, 0x68, 0x61, 0x64, 0x6f, 0x77, 0x73, 0x6f, 0x63, 0x6b, 0x73,
+	0xaa, 0x02, 0x16, 0x58, 0x72, 0x61, 0x79, 0x2e, 0x50, 0x72, 0x6f, 0x78, 0x79, 0x2e, 0x53, 0x68,
+	0x61, 0x64, 0x6f, 0x77, 0x73, 0x6f, 0x63, 0x6b, 0x73, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f,
+	0x33,
 }
 
 var (
diff --git a/proxy/shadowsocks/config.proto b/proxy/shadowsocks/config.proto
index f9db66b2..8f9fb891 100644
--- a/proxy/shadowsocks/config.proto
+++ b/proxy/shadowsocks/config.proto
@@ -22,7 +22,8 @@ enum CipherType {
   AES_128_GCM = 5;
   AES_256_GCM = 6;
   CHACHA20_POLY1305 = 7;
-  NONE = 8;
+  XCHACHA20_POLY1305 = 8;
+  NONE = 9;
 }
 
 message ServerConfig {