We use overseas advanced technical process to process the walnut shell grains which is as porous materials for the vitrified bonded grinding wheel. Compared with traditional porous materials of Refined Naphthalene, it has many advantages, such as pore even, odorless, cheap and easy to operate, no harm to operator. And even more, it can change freely according to grinding wheel pore. Thus, in the foreign countries, it had been adopted widely in the industry of abrasive since 1960´s.