Abstract: Based on the difficulties in welding of light material like aluminum alloy,which required low energy input and other requirements,the control parameter relationship formula was established for sinusoid modulation pulsed MIG welding of aluminum,and experiments were used to validate its correctness and practicability.Due to the characteristics of sinusoidal waveform such as infinite derivative continuity,eternal periodicity and less controlled variable,the modulation pulse waveform can realize to effectively and precisely regulate welding energy,and the stable and high quality fish scale weld seam can be obtained.While experiments indicated that the change range of m value in the relationship formula is from 2 to 3.There are advantages in sinusoid modulation pulse MIG welding such as wider parameters matching range,less interference from external working environmental factors,which lays the theoretical foundation for the parameter unification exploitation in the sinusoid modulation pulsed MIG welding process.