Abstract: Pulsed MIG welding,which has character of easy to control heat input and droplet transfer during arc-welding,has become the focus of research work.The problem is how to obtain the characteristic information of droplet transfer during welding,which has been still unsolved at present,as a result,it is difficult to control metal transition in loop way.After experiment in many ways,we finally get high Signal to Noise (SNR) spectral information of droplet transfer by the way of lowering the signal dimensions from pulsed MIG welding arc light.Results from our study show that the spectral information of droplet transfer is even more universal and stable under various condition of welding.At last,we has successfully efficiently controlled the droplet transfer of pulsed MIG welding and realized ODPP process using the spectral information.