diff --git a/service/xboard/service.go b/service/xboard/service.go
index 4a4e90ea..057e7968 100644
--- a/service/xboard/service.go
+++ b/service/xboard/service.go
@@ -3,6 +3,7 @@ package xboard
 import (
 	"bytes"
 	"context"
+	"crypto/md5"
 	"encoding/base64"
 	"encoding/json"
 	"fmt"
@@ -33,19 +34,17 @@ func fixSSKey(key string, length int) string {
 		return key
 	}
 	
-	// Legacy repetition/truncation logic for raw string keys (common in Xboard/V2board)
-	password := key
-	if len(password) > length {
-		password = password[:length]
-	}
-	for len(password) < length {
-		password += password
-	}
-	// Re-truncate after repetition
-	password = password[:length]
+	// Xboard style for Shadowsocks 2022: Base64(MD5_Hex(password))
+	// 32 hex characters happen to be exactly 32 bytes of ASCII, perfect for aes-256-gcm
+	hash := md5.Sum([]byte(key))
+	hexHash := fmt.Sprintf("%x", hash)
 	
-	// Convert to Base64 so sing-box treats it as a raw byte key
-	return base64.StdEncoding.EncodeToString([]byte(password))
+	// For 128-bit methods, truncate the hex string to 16
+	if length == 16 && len(hexHash) > 16 {
+		hexHash = hexHash[:16]
+	}
+	
+	return base64.StdEncoding.EncodeToString([]byte(hexHash))
 }
 
 func RegisterService(registry *boxService.Registry) {