Aiming at the special requirement of laser cladding on aereoengine blade, the influences of continuous/pulse beam on cladding performance for K403 substrate was studied experimentally on a transverse CO₂ laser and its processing system,compared with continuous laser beam,by using pulse laser beam,the hardness of cladding layer increased for about 5%,while the duty rate and area of heat-affected zone decreased for about 20% and about 50%,respectively. Cladding with pulse laser beam could weaken the gathering of alloy elements and the formation of low melting eutectic structure,resulting in the absence of liquid state membrane on grain boundary. In addition,the tension stress in solidification is greatly reduced during pulse laser cladding due to the less deform of substrate,and a higher degree of superheat induced fully mixing of the melting pool and decreased the brittleness of substrate,so,the heat cracking behavior of K403 substrate under continuous laser beam cladding was avoided under pulse laser beam cladding.