diff --git a/demo/composer/app.php b/demo/composer/app.php
index 4df50e1..8949c13 100644
--- a/demo/composer/app.php
+++ b/demo/composer/app.php
@@ -113,7 +113,7 @@ try {
     $sspuller = new SmsStatusPuller($appid, $appkey);
 
     // 拉取短信回执
-    $callbackResult = $spuller->pullCallback(10);
+    $callbackResult = $sspuller->pullCallback(10);
     $callbackRsp = json_decode($callbackResult);
     echo $callbackResult;
 
diff --git a/demo/simple/app.php b/demo/simple/app.php
index 712b8b7..df2061a 100644
--- a/demo/simple/app.php
+++ b/demo/simple/app.php
@@ -112,7 +112,7 @@ try {
     $sspuller = new SmsStatusPuller($appid, $appkey);
 
     // 拉取短信回执
-    $callbackResult = $spuller->pullCallback(10);
+    $callbackResult = $sspuller->pullCallback(10);
     $callbackRsp = json_decode($callbackResult);
     echo $callbackResult;