diff --git a/wxwork_finance_sdk.php b/wxwork_finance_sdk.php
index d90ce22..82f856a 100644
--- a/wxwork_finance_sdk.php
+++ b/wxwork_finance_sdk.php
@@ -1,23 +1,50 @@
 <?php
-
-
-try {
-$obj = new WxworkFinanceSdk("wwd08coe7d775abaaa", "zJ6k0naVVQ--gt9PUSSEvs03zW_nlDVmjAkPOTAfrew", [
-    "proxy_password" => "world",
-    "timeout" => -2,
-]);
-// 私钥地址
-$privateKey = file_get_contents('private.pem');
-
-$chats = json_decode($obj->getChatData(0, 100), true);
-var_dump($chats);
-foreach ($chats['chatdata'] as $val) {
-    $decryptRandKey = null;
-    openssl_private_decrypt(base64_decode($val['encrypt_random_key']), $decryptRandKey, $privateKey, OPENSSL_PKCS1_PADDING);
-    $obj->downloadMedia($sdkFileId, "/tmp/download/文件新名称.后缀");
+gc_enable();
+$startMemUsed = memory_get_usage();
+function cal_mem()
+{
+        global $startMemUsed;
+        echo "memory,", ceil((memory_get_usage() - $startMemUsed) / 1024), 'KB', PHP_EOL;
 }
+echo "start mypid=", getmypid(), PHP_EOL;
+sleep(2);
+$sdk = new WxworkFinanceSdk("1", "2");
+$privateKey = <<<EOF
+-----BEGIN RSA PRIVATE KEY-----
 
+-----END RSA PRIVATE KEY-----
+EOF;
+$seq = 0;
+$str = str_repeat('X', 1024 * 1024);
 
-}catch(\WxworkFinanceSdkException $e) {
-    var_dump($e->getMessage(), $e->getCode());
-}
+do{
+
+        echo "sync seq={$seq} ==>", cal_mem(), PHP_EOL;
+        gc_mem_caches();
+        gc_collect_cycles();
+        $wxChat = $sdk->getChatData($seq, 100);
+        $chats = json_decode($wxChat, true);
+        $chatRows = $chats['chatdata'];
+        foreach ($chatRows as $val) {
+                $decryptRandKey = null;
+                $decryptData = openssl_private_decrypt(base64_decode($val['encrypt_random_key']), $decryptRandKey, $privateKey, OPENSSL_PKCS1_PADDING);
+                $decryptChatRawContent = $sdk->decryptData($decryptRandKey, $val['encrypt_chat_msg']);
+                $j2 = json_decode($decryptChatRawContent, true);
+                $msgType = $j2['msgtype'];
+                     if (in_array($msgType, ['image', 'video'])) {
+                        try {
+                                $sdk->downloadMedia($j2[$msgType]['sdkfileid'], "/tmp/download/{$j2[$msgType]['md5sum']}");
+                        }catch(\Exception $e) {
+                                var_dump($e);
+                                var_dump($e->getMessage(), $e->getCode());
+                                sleep(1);
+                        }
+                }
+                unset($decryptRandKey);
+        }
+        echo "loop done ===>", cal_mem();
+        unset($chatRows, $wxChat, $chats);
+        gc_collect_cycles();gc_collect_cycles();
+        $seq = $val['seq'];
+}while(true);
+cal_mem();
\ No newline at end of file