According to the urgent need of wear, corrosion and selflubricating properties of the pump plunger, solid lubrication film to strengthen the surface of 45 steel was prepared by laser claddingion sulfurizing. Surface structure, morphology and phase composition of the film were characterized using scanning electron microscope (SEM), atomic force microscope (AFM), electron probe microanalysis (EPMA), auger electron spectroscope (AES), and Xray diffraction (XRD). Frictionreduction and wearresistance of the sulfide layer were investigated by the friction and wear tester. The results show that the sulfide layer with the thickness of about 35 μm on the surface is obtained using the laser claddingion sulfurizing process. The layer is soft and loose, mainly containing FeS. There is no obvious transition between the sulfide layer and the substrate, and the boundaries combine tightly. The sulfide layer is an ideal friction surface, possessing excellent properties of frictionreduction, wearresistance. Laser claddingion sulfurizing process provides a new method for situ synthesis of solid lubricant FeS.