The end cap working face is strengthened by Nd:YAG laser, and alloy layer of TiC is obtained. The phase composition, microscopic structure and wear-resisting property are analyzed by X-ray diffraction instrument, microhardness tester, scanning electron microscope and energy dispersive spectroscope. Analysis and tests indicate that the main phases of alloy layer consist of martensite, retained austenite, Cr23C6 and TiC. The microstructure of the alloy layer is fine, without microcracks, pores or other defects. The alloy layer is metallurgically bonded to the substrate, and its microhardness is up to 358 HV, which is about 1.6 times of that of the substrate. The wearout surface is relatively smooth, without obvious furrows or spalling phenomena.