diff --git a/application/module/Helpers/Captcha.php b/application/module/Helpers/Captcha.php
new file mode 100644
index 00000000..dc61b759
--- /dev/null
+++ b/application/module/Helpers/Captcha.php
@@ -0,0 +1,52 @@
+<?php
+namespace Helpers;
+
+class Captcha extends \Zend_Controller_Plugin_Abstract
+{
+	public $captcha;
+	
+	private $sessionName = "captcha";
+	
+	function __construct($db = NULL)
+	{
+		$this->loadCaptcha();
+	}
+	
+	public function loadCaptcha()
+	{
+		$this->captcha = new \Zend_Captcha_Image(array(  
+			  'captcha' => 'Image',
+			  'wordLen' => 4,
+			  'fontsize'=>16,
+			  'width' => 100,
+			  'height' => 38,
+			  'dotNoiseLevel'=>2,
+			  'lineNoiseLevel'=>1,
+			  'timeout' => 300,
+			  'font' => '../data/fonts/ggbi.ttf',  
+			  'imgDir' => 'vdimg/',
+			  'imgUrl' => '/vdimg',
+		   ));
+	}
+	
+	public function setCaptcha(){
+		$this->captcha->generate();
+		$_SESSION[$this->sessionName] = $this->captcha->getWord();
+		$url = $this->captcha->getImgUrl()
+			  .$this->captcha->getId()
+			  .$this->captcha->getSuffix();
+		
+		return $url;
+	}
+	
+	public function isValid($captchaword)
+	{
+		if($captchaword == $_SESSION[$this->sessionName])
+		{
+			return true;
+		}else{
+			return false;
+		}
+	}
+	
+}
\ No newline at end of file