这是我做过的一个实现，这是一个标准的重写（http：//inchoo.net/ecommerce/magento/how_to_override_magento_model_classes/），我这样做是为了不太深入重写系统。

class Your_Company_Model_Address_Total_Shipping extends Mage_Sales_Model_Quote_Address_Total_Shipping
{

    /**
     * Collect totals information about shipping
     *
     * @param   Mage_Sales_Model_Quote_Address $address
     * @return  Mage_Sales_Model_Quote_Address_Total_Shipping
     */
    public function collect(Mage_Sales_Model_Quote_Address $address)
    {
        parent::collect($address);

        $method = $address->getShippingMethod();

        if ($method) {
            foreach ($address->getAllShippingRates() as $rate) {
                if ($rate->getCode()==$method) {
                    $shippingDescription = $rate->getMethodTitle();
                    if (stripos($shippingDescription, ",") > -1)
                        $shippingDescription = substr($shippingDescription, 0, stripos($shippingDescription, ","));
                    $address->setShippingDescription(trim($shippingDescription, ' -'));
                    break;
                }
            }
        }

        return $this;
    }
}