Abstract: A fuzzy self-tuning PID control method was proposed for pulsed MIG welding of aluminum alloy sheet.The principle and design ideas were introduced.Fuzzy self-tuning PID parameter was implemented by introducing the fuzzy logic controller into the established Simulink model of PID controller.Then input adaptability experiment contrast and anti-interference test were conducted and analyzed.It shows that fuzzy self-tuning controller in input adaptability and anti-interference is better and the arc welding power performance can be further improved.Finally the contrast of welding experiments on 1 mm thickness aluminum alloy between traditional PID control and fuzzy self-tuning parameter PID control were carried out.The experiments result shows that high welding quality and stable welding process with good weld seam,less welding spatter,relatively smooth welding process are achieved by the proposed method.