Due to the fast development of automobile industry in modern society and increasingly fast change of vehicle models,robots play an irreplaceable role in stabilizing product quality, increasing productivity,reducing production cost and other aspects. In the meantime,it is more important to provide welding jigs with high quality and high flexibility according with the features of automobiles.The quick exchange methods and design points of welding jigs for multiple products in the production line of exhaust system are introduced,including how to choose the quick exchange methods according to different product features,the mechanical structural features of different quick exchange methods,innovative concepts,and a great contribution for the flexible production.