For cracks and deformations appeared in continuous laser cladding in aircraft engine turbine blade, we propose a new method on power supply control based on the 5-kW continuous transverse flow CO2 laser. Pulse laser power can be obtained by the control of software and interrelated components. The method can over come the problem of high costs and instability by using high power switch source supply. The pulse modulation frequency can reach 10 Hz and the duty cycle can be modulated between 5% and 100%. K403 alloy of the turbine blade is cladded with Stellite X-40 alloy powder in the surface using this kind of pulse laser power whose maximum laser power is 4 kW, and the repetitive frequency is 5 Hz with the duty cycle of 20%. The result shows that, compared with that using the continuous laser power, the heat affected zone is reduced 50%, and the microhardness is improved 5%. So the binding performance of the interface is as good as the base metal, and the cladding cracks and blade deformations disappear.