As we all known, the mold will be worn in use. The number of a mold sharpening is limited, the more time of flushes between two grinding, it description that the mold service life longer, so the requirements of the mold with high wear resistance. In order to prolong the service life of the mold, the mold will not premature failure. Recently, Yingli group is doing high precision surface strengthening treatment for the particular part that the mold really bear the abrasion effect, this can greatly extend and improve the service life of the mold. Not only can greatly save the production cost, saving production time, but also create greater economic benefits for Yingli.