Abstract: In order to conduct laser welding of H62 brass which has high reflectivity for laser beam with wave length of 1.06 μm,such parameters as pulse laser peak power,laser frequency,single pulse energy,pulse width,pulse waveform,welding speed and defocusing amount etc are reasonably set up through theoretical analysis and experimental verify.H62 brass can be welded by pulse laser successfully.The results show that the pulse laser welding system of HWLW-300A which possess single pulse energy of about 10·x(J/mm),the pulse waveforms of sudden rise and slow fall,the defocusing amount of -2mm and the relationship among laser beam diameter d,pulse laser frequency f and welding speed v meet the f·d=(1.2~1.4)·v can successfully weld H62 brass with thickness of x mm.