The laser welding experiments on weld 0.2 mm thickness of the superalloys GH4169 with micro-laser pulse is carried out, the impact of welding process parameters on joints forming is analyzed, and the microstructure and properties of joints are studied by making use of optical microscopy, electronic precision stretching machine, and other analysis and detection methods. The results show that using argon as a shielding gas, 0.2 mm thick GH4169 to the laser as heat source can be successful butt welding with process parameters of the power of 12.8 W, pulse width of 2.7 ms, pulse frequency of 5.0 Hz, and a good welded appearance is formed, and the joint tensile strength is higher than the base metal. The microstructure composed of welded joints is small equiaxed grains in the weld center and columnar grains near the fusion line, and in the heat-affected zone of the joints, there is a black line formation which is similar to the crack after corrosion because of the existence of grain boundary precipitates. Microhardness of welded joints is higher than that of the base metal.