The method is to combine dynaform numerical simulation techniques and orthogonal experimental design to analyze the influence factors of intensity ratio,clearance between punch and die,thin side blank holder rate,friction coefficient,blank-holder force and thickness ratio to improve the quality of TWBs,. The research show that Strength ratio, friction coefficient,blank-holder force and the thickness ratio on the forming results is relative bigger. As a whole,tailor-welded sheet forming improved with the increment of the strength of parent metal,because the deformation degree of thin side parent metal reduce the weld-line movement for enhancing its ability to resist deformation. Friction coefficient and blank-holder force is not very big on the influence of the formability of tailor-welded sheet,but the bigger friction coefficient and the bigger total blankholder force affect on both sides of the base material of liquidity,finally,it affects the quality of the forming of the sheet metal.Thickness ratio should be carefully considered in the design of welding plate. Generally,the thickness ratio between 1. 0-1. 0and 1. 0-1. 4 improved the forming of tailor-welded blanks with arc-weld-line,the small and large of thickness ratio are not beneficial to tailor-welded sheet forming.