Abstract: In the AC-DC double wire SAW system, the interference of two arc is serious.It makes the welding process unstable.According to the analysis of the electromagnetic force between two arc, the main factor which affects the welding process has been found, it is the current.The electromagnetic force is proportional to the product of the two arc's current.With this conclusion, a control strategy is put forward.Resort to the welding voltage examine circuit and pulse synergic control technology, the base and peak values of the pulse current are under control.The force between two arc will be reduced, and the process will be stabilized.The double wire AC-DC pulse weld controller that designed for the submerge welding has been developed in combination with electronic technology, automation theory and MCU technology.During the welding process, electric signal testing and analyzing system is applied for electric signal sampling such as welding current, voltage waveform and so on.The result proved the function and reliability of this equipment.