The scanning path of laser alloying on the working surface of valve core end caps is programmed based on its shape characteristics and wear conditions. According to the different wear statuses in actual working surface, the working face of valve core end caps is divided into three alloying areas. And a bi-directional spiral path is designed in order to achieve those different areas with different alloying area ratios on the working surface. Subsequently, NdYAG laser device is utilized to achieve programming machining, and the fabricated samples are tested in wear test separately with bi-directional spiral scanning path and straight scanning path. It is observed that the wear-resisting property of the working surface of the valve core end caps scanned through bi-directional spiral path is 2.5 times different when scanned by straight scanning path, and its deformation is just about one third of the samples which are scanned by straight scanning path.