add custom attribute or default attribute in magento admin product grid view

here is the code paste it into your adminhtml/block/catalog/product/grid.php

$manufacturer_items = Mage::getModel('eav/entity_attribute_option')->getCollection()->setStoreFilter()->join('attribute','attribute.attribute_id=main_table.attribute_id', 'attribute_code');
        foreach ($manufacturer_items as $manufacturer_item) :
            if ($manufacturer_item->getAttributeCode() == 'manufacturer')
                $manufacturer_options[$manufacturer_item->getOptionId()] = $manufacturer_item->getValue();
        endforeach;
       
   
        $this->addColumn('manufacturer',
            array(
                'header'=> Mage::helper('catalog')->__('Manufacturer'),
                'width' => '180px',
                'index' => 'manufacturer',
                'type'  => 'options',
                'options' => $manufacturer_options,
        ));
       
        $group_items = Mage::getModel('eav/entity_attribute_option')->getCollection()->setStoreFilter()->join('attribute','attribute.attribute_id=main_table.attribute_id', 'attribute_code');
        foreach ($group_items as $group_item) :
            if ($group_item->getAttributeCode() == 'group')
                $group_options[$group_item->getOptionId()] = $group_item->getValue();
        endforeach;
       
   
        $this->addColumn('group',
            array(
                'header'=> Mage::helper('catalog')->__('Group'),
                'width' => '180px',
                'index' => 'group',
                'type'  => 'options',
                'options' => $group_options,
        )); 

 

Note:use your attribute code and name