diff --git a/.gitignore b/.gitignore
index 42cd73d..6dd4b0b 100644
--- a/.gitignore
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-                "url": "https://api.github.com/repos/sebastianbergmann/recursion-context/zipball/5b0cd723502bac3b006cbf3dbf7a1e3fcefe4fa8",
-                "reference": "5b0cd723502bac3b006cbf3dbf7a1e3fcefe4fa8",
-                "shasum": "",
-                "mirrors": [
-                    {
-                        "url": "https://dl.laravel-china.org/%package%/%reference%.%type%",
-                        "preferred": true
-                    }
-                ]
-            },
-            "require": {
-                "php": "^7.0"
-            },
-            "require-dev": {
-                "phpunit/phpunit": "^6.0"
-            },
-            "type": "library",
-            "extra": {
-                "branch-alias": {
-                    "dev-master": "3.0.x-dev"
-                }
-            },
-            "autoload": {
-                "classmap": [
-                    "src/"
-                ]
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "BSD-3-Clause"
-            ],
-            "authors": [
-                {
-                    "name": "Jeff Welch",
-                    "email": "whatthejeff@gmail.com"
-                },
-                {
-                    "name": "Sebastian Bergmann",
-                    "email": "sebastian@phpunit.de"
-                },
-                {
-                    "name": "Adam Harvey",
-                    "email": "aharvey@php.net"
-                }
-            ],
-            "description": "Provides functionality to recursively process PHP variables",
-            "homepage": "http://www.github.com/sebastianbergmann/recursion-context",
-            "time": "2017-03-03T06:23:57+00:00"
-        },
-        {
-            "name": "sebastian/resource-operations",
-            "version": "2.0.1",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/sebastianbergmann/resource-operations.git",
-                "reference": "4d7a795d35b889bf80a0cc04e08d77cedfa917a9"
-            },
-            "dist": {
-                "type": "zip",
-                "url": "https://api.github.com/repos/sebastianbergmann/resource-operations/zipball/4d7a795d35b889bf80a0cc04e08d77cedfa917a9",
-                "reference": "4d7a795d35b889bf80a0cc04e08d77cedfa917a9",
-                "shasum": "",
-                "mirrors": [
-                    {
-                        "url": "https://dl.laravel-china.org/%package%/%reference%.%type%",
-                        "preferred": true
-                    }
-                ]
-            },
-            "require": {
-                "php": "^7.1"
-            },
-            "type": "library",
-            "extra": {
-                "branch-alias": {
-                    "dev-master": "2.0-dev"
-                }
-            },
-            "autoload": {
-                "classmap": [
-                    "src/"
-                ]
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "BSD-3-Clause"
-            ],
-            "authors": [
-                {
-                    "name": "Sebastian Bergmann",
-                    "email": "sebastian@phpunit.de"
-                }
-            ],
-            "description": "Provides a list of PHP built-in functions that operate on resources",
-            "homepage": "https://www.github.com/sebastianbergmann/resource-operations",
-            "time": "2018-10-04T04:07:39+00:00"
-        },
-        {
-            "name": "sebastian/version",
-            "version": "2.0.1",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/sebastianbergmann/version.git",
-                "reference": "99732be0ddb3361e16ad77b68ba41efc8e979019"
-            },
-            "dist": {
-                "type": "zip",
-                "url": "https://api.github.com/repos/sebastianbergmann/version/zipball/99732be0ddb3361e16ad77b68ba41efc8e979019",
-                "reference": "99732be0ddb3361e16ad77b68ba41efc8e979019",
-                "shasum": "",
-                "mirrors": [
-                    {
-                        "url": "https://dl.laravel-china.org/%package%/%reference%.%type%",
-                        "preferred": true
-                    }
-                ]
-            },
-            "require": {
-                "php": ">=5.6"
-            },
-            "type": "library",
-            "extra": {
-                "branch-alias": {
-                    "dev-master": "2.0.x-dev"
-                }
-            },
-            "autoload": {
-                "classmap": [
-                    "src/"
-                ]
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "BSD-3-Clause"
-            ],
-            "authors": [
-                {
-                    "name": "Sebastian Bergmann",
-                    "email": "sebastian@phpunit.de",
-                    "role": "lead"
-                }
-            ],
-            "description": "Library that helps with managing the version number of Git-hosted PHP projects",
-            "homepage": "https://github.com/sebastianbergmann/version",
-            "time": "2016-10-03T07:35:21+00:00"
-        },
-        {
-            "name": "theseer/tokenizer",
-            "version": "1.1.0",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/theseer/tokenizer.git",
-                "reference": "cb2f008f3f05af2893a87208fe6a6c4985483f8b"
-            },
-            "dist": {
-                "type": "zip",
-                "url": "https://api.github.com/repos/theseer/tokenizer/zipball/cb2f008f3f05af2893a87208fe6a6c4985483f8b",
-                "reference": "cb2f008f3f05af2893a87208fe6a6c4985483f8b",
-                "shasum": "",
-                "mirrors": [
-                    {
-                        "url": "https://dl.laravel-china.org/%package%/%reference%.%type%",
-                        "preferred": true
-                    }
-                ]
-            },
-            "require": {
-                "ext-dom": "*",
-                "ext-tokenizer": "*",
-                "ext-xmlwriter": "*",
-                "php": "^7.0"
-            },
-            "type": "library",
-            "autoload": {
-                "classmap": [
-                    "src/"
-                ]
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "BSD-3-Clause"
-            ],
-            "authors": [
-                {
-                    "name": "Arne Blankerts",
-                    "email": "arne@blankerts.de",
-                    "role": "Developer"
-                }
-            ],
-            "description": "A small library for converting tokenized PHP source code into XML and potentially other formats",
-            "time": "2017-04-07T12:08:54+00:00"
-        },
-        {
-            "name": "webmozart/assert",
-            "version": "1.3.0",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/webmozart/assert.git",
-                "reference": "0df1908962e7a3071564e857d86874dad1ef204a"
-            },
-            "dist": {
-                "type": "zip",
-                "url": "https://api.github.com/repos/webmozart/assert/zipball/0df1908962e7a3071564e857d86874dad1ef204a",
-                "reference": "0df1908962e7a3071564e857d86874dad1ef204a",
-                "shasum": "",
-                "mirrors": [
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-                        "url": "https://dl.laravel-china.org/%package%/%reference%.%type%",
-                        "preferred": true
-                    }
-                ]
-            },
-            "require": {
-                "php": "^5.3.3 || ^7.0"
-            },
-            "require-dev": {
-                "phpunit/phpunit": "^4.6",
-                "sebastian/version": "^1.0.1"
-            },
-            "type": "library",
-            "extra": {
-                "branch-alias": {
-                    "dev-master": "1.3-dev"
-                }
-            },
-            "autoload": {
-                "psr-4": {
-                    "Webmozart\\Assert\\": "src/"
-                }
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "MIT"
-            ],
-            "authors": [
-                {
-                    "name": "Bernhard Schussek",
-                    "email": "bschussek@gmail.com"
-                }
-            ],
-            "description": "Assertions to validate method input/output with nice error messages.",
-            "keywords": [
-                "assert",
-                "check",
-                "validate"
-            ],
-            "time": "2018-01-29T19:49:41+00:00"
-        }
-    ],
-    "packages-dev": [],
-    "aliases": [],
-    "minimum-stability": "stable",
-    "stability-flags": [],
-    "prefer-stable": false,
-    "prefer-lowest": false,
-    "platform": [],
-    "platform-dev": []
-}
diff --git a/phpunit.xml b/phpunit.xml
new file mode 100644
index 0000000..ae9dbd6
--- /dev/null
+++ b/phpunit.xml
@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<phpunit backupGlobals="false"
+         backupStaticAttributes="false"
+         bootstrap="vendor/autoload.php"
+         colors="true"
+         convertErrorsToExceptions="true"
+         convertNoticesToExceptions="true"
+         convertWarningsToExceptions="true"
+         processIsolation="false"
+         stopOnFailure="false">
+    <testsuites>
+        <testsuite name="decode">
+            <directory suffix=".php">./tests</directory>
+        </testsuite>
+    </testsuites>
+    <filter>
+        <whitelist>
+            <directory suffix=".php">src/</directory>
+        </whitelist>
+    </filter>
+</phpunit>
\ No newline at end of file
diff --git a/src/Decoder.php b/src/Decoder.php
index 72878ff..606542c 100644
--- a/src/Decoder.php
+++ b/src/Decoder.php
@@ -1,32 +1,19 @@
 <?php
 namespace jmluang\ssr;
 
-use jmluang\ssr\Traits\Util;
 use jmluang\ssr\Exception\DecodeException;
+use jmluang\ssr\Interfaces\canDecode;
 
 class Decoder 
 {
-    use Util;
-
     /**
-     * The origin Url
+     * The url
      */
     public $origin;
 
-    /**
-     * The base64 decode string
-     */
-    public $uri;
-
-    /**
-     * The Decode Object, must implement of jmluang\canDecode 
-     */
-    public $sock;
-
     public function __construct($url)
     {
         $this->origin = $url;
-        $this->uri = $this->init($url); 
     }
 
     /**
@@ -37,11 +24,12 @@ public function __construct($url)
      */
     public function decode()
     {
-        $object = $this->sock->decode($this->uri);
-        if (!isset($object->host)) {
-            throw new DecodeException();
+        $handler = $this->getHandler($this->origin);
+        if (!($handler instanceof canDecode)) {
+            throw new DecodeException('not support type');
         }
-        return $object;
+
+        return $handler->decode($this->origin);
     }
 
     /**
@@ -58,62 +46,22 @@ public function qrcode($size = 300)
     }
 
     /**
-     * replace spec char
+     * Get class by url type
      * 
-     * @param string $uri
+     * @param string $url
      * 
-     * @return string
-     * @throws jmluang\ssr\Exception\DecodeException
+     * @return null|jmluang\ssr\Interfaces\canDecode
      */
-    private function init($url)
+    private function getHandler(string $url)
     {
-        // Check the url is ss or ssr
-        if (!$this->isSs($url) && !$this->isSsr($url)) {
-            throw new DecodeException("Unsupport type");
+        if (Ss::check($url)) {
+            return new Ss;
         }
 
-        // Check whether the url is empty or not
-        if (empty($this->uri)) {
-            throw new DecodeException("Illegal url");
+        if (Ssr::check($url)) {
+            return new Ssr;
         }
 
-        return $this->base64Decode($this->uri);
+        return null;
     }
-
-    /**
-     * check is ss
-     * 
-     * @param string $uri
-     * 
-     * @return int
-     */
-    private function isSs($url)
-    {
-        preg_match("#^ss://(?<uri>.*)#", $url, $params);
-        if (isset($params['uri'])) {
-            $this->uri = $params['uri'];
-            $this->sock = new Ss;
-            return true;
-        }
-        return false;
-    }
-
-    /**
-     * check is ssr
-     * 
-     * @param string $uri
-     * 
-     * @return int;
-     */
-    private function isSsr($url)
-    {
-        preg_match("#^ssr://(?<uri>.*)#", $url, $params);
-        if (isset($params['uri'])) {
-            $this->uri = $params['uri'];
-            $this->sock = new Ssr;
-            return true;
-        }
-        return false;
-    }
-
 }
diff --git a/src/Exception/DecodeFailureException.php b/src/Exception/DecodeFailureException.php
new file mode 100644
index 0000000..f02b858
--- /dev/null
+++ b/src/Exception/DecodeFailureException.php
@@ -0,0 +1,7 @@
+<?php
+namespace jmluang\ssr\Exception;
+
+class DecodeFailureException extends DecodeException
+{
+
+}
\ No newline at end of file
diff --git a/src/Interfaces/canDecode.php b/src/Interfaces/canDecode.php
index 12094fb..d971574 100644
--- a/src/Interfaces/canDecode.php
+++ b/src/Interfaces/canDecode.php
@@ -3,5 +3,21 @@
 
 interface canDecode 
 {
-    public function decode($uri);
+    /**
+     * Decode the url
+     * 
+     * @param string $uri
+     * 
+     * @return Object
+     */
+    public function decode(string $url);
+
+    /**
+     * Check if the url can decode by the use class
+     * 
+     * @param string $url
+     * 
+     * @return boolean
+     */
+    public static function check(string $url) : bool;
 }
\ No newline at end of file
diff --git a/src/Ss.php b/src/Ss.php
index 981a5ea..ef6f7f1 100644
--- a/src/Ss.php
+++ b/src/Ss.php
@@ -1,23 +1,47 @@
 <?php
 namespace jmluang\ssr;
+
+use jmluang\ssr\Exception\DecodeFailureException;
 use jmluang\ssr\Interfaces\canDecode;
+use jmluang\ssr\Traits\Util;
 
 class Ss implements canDecode
 {
+    use Util;
+
     /**
-     * Decode the SS uri
+     * Check if the url can decode by the use class
      * 
-     * @param string $uri
+     * @param string $url
      * 
-     * @return Ss 
+     * @return boolean
      */
-    public function decode($uri)
+    public static function check(string $url) : bool
     {
+        preg_match("#^ss://(?<uri>.*)#", $url, $params);
+        if (isset($params['uri'])) {
+            return true;
+        }
+        return false;
+    }
+
+    /**
+     * Decode the SS url
+     * 
+     * @param string $url
+     * 
+     * @throws jmluang\ssr\Exception\DecodeFailureException
+     * @return Ss
+     */
+    public function decode(string $url)
+    {
+        $uri = $this->base64Decode(substr($url, strlen('ss://')));
+
         //ss://method:password@host:port
         $pattern = '/(?<method>.*):(?<password>.*)@(?<host>.*):(?<port>.*)/';
         preg_match($pattern, $uri, $params);
         if (empty($params)) {
-            return $this;
+            throw new DecodeFailureException('can not decode this url');
         }
 
         // set object param
diff --git a/src/Ssr.php b/src/Ssr.php
index e7da2f6..5623c59 100644
--- a/src/Ssr.php
+++ b/src/Ssr.php
@@ -1,6 +1,7 @@
 <?php
 namespace jmluang\ssr;
 
+use jmluang\ssr\Exception\DecodeFailureException;
 use jmluang\ssr\Interfaces\canDecode;
 use jmluang\ssr\Traits\Util;
 
@@ -8,21 +9,40 @@ class Ssr implements canDecode
 {
     use Util;
 
+    /**
+     * Check if the url can decode by the use class
+     * 
+     * @param string $url
+     * 
+     * @return boolean
+     */
+    public static function check(string $url): bool
+    {
+        preg_match("#^ssr://(?<uri>.*)#", $url, $params);
+        if (isset($params['uri'])) {
+            return true;
+        }
+        return false;
+    }
+
     /**
      * Decode the SSR uri
      * 
      * @param string $uri
      * 
+     * @throws jmluang\ssr\Exception\DecodeFailureException
      * @return Ss 
      */
-    public function decode($uri)
+    public function decode(string $url)
     {
+        $uri = $this->base64Decode(substr($url, strlen('ssr://')));
+
         // ssr://server:port:protocol:method:obfs:password_base64/?params_base64
         $pattern = '#(?<host>.*):(?<port>.*):(?<protocol>.*):(?<method>.*):(?<obfs>.*):(?<password_base64>.*)/\?(?<params_base64>.*)#';
         
         preg_match($pattern, $uri, $params);
         if (empty($params)) {
-            return $this;
+            throw new DecodeFailureException('can not decode this url');
         }
         
         // set object param
diff --git a/tests/Check.php b/tests/Check.php
new file mode 100644
index 0000000..30d83af
--- /dev/null
+++ b/tests/Check.php
@@ -0,0 +1,23 @@
+<?php
+declare(strict_types=1);
+
+use PHPUnit\Framework\TestCase;
+use jmluang\ssr\Ss;
+use jmluang\ssr\Ssr;
+
+final class Chekc extends TestCase
+{
+    public function testSsCheck() : void
+    {
+        $this->assertEquals(false, Ss::check(""));
+        $this->assertEquals(false, Ss::check("ss:/123"));
+        $this->assertEquals(true,  Ss::check("ss://123"));
+    }
+
+    public function testSsrCheck() : void
+    {
+        $this->assertEquals(false, Ssr::check(""));
+        $this->assertEquals(false, Ssr::check("ssr:/123"));
+        $this->assertEquals(true,  Ssr::check("ssr://123"));
+    }
+}
\ No newline at end of file
diff --git a/tests/DecoderTest.php b/tests/Decode.php
similarity index 92%
rename from tests/DecoderTest.php
rename to tests/Decode.php
index 8a3f35a..ba03966 100644
--- a/tests/DecoderTest.php
+++ b/tests/Decode.php
@@ -4,9 +4,9 @@
 use PHPUnit\Framework\TestCase;
 use jmluang\ssr\Decoder;
 use jmluang\ssr\Exception\DecodeException;
-use phpDocumentor\Reflection\Types\Void_;
+use jmluang\ssr\Exception\DecodeFailureException;
 
-final class DecoderTest extends TestCase
+final class Decode extends TestCase
 {
     public function testCanNotDecodeEmptyUrl() : void
     {
@@ -22,7 +22,7 @@ public function testCanNotDecodeIllegalUrl() : Void
 
     public function testCanNotDecodeIllegalSsUrl() : void
     {
-        $this->expectException(DecodeException::class);
+        $this->expectException(DecodeFailureException::class);
         (new Decoder('ss://;test'))->decode(); 
     }
 
@@ -34,7 +34,7 @@ public function testCanNotDecodeIllegalEmptySsUrl() : void
 
     public function testCanNotDecodeIllegalSsrUrl() : void
     {
-        $this->expectException(DecodeException::class);
+        $this->expectException(DecodeFailureException::class);
         (new Decoder('ssr://123'))->decode();
     }