Abstract: It is the purpose to improve surface properties of 2Cr13 steel with laser surface alloying. In different parameters of technology, observing microscopic structure strengthened by laser surface alloying with a scanning electron microscopy and measuring microhardness strengthened by laser surface alloying with a microsclerometer. Result in laser surface alloying can greatly strengthen hardness and hardwearing of 2Cr13 steel surface, and develop application of 2Cr13 steel.