In the process of drawing , the sheet often appears crinkling , bloating and ripping .The sheet drawing process includes complex physical phenomena revolved in no n -linearity of geometry , material and boundary .So it is very difficult to be solved by analytic method .Numerical simulation of sheet drawing was made by means of finite element software ANSYS/ LS -DYNA and the position of potential flaw was analyzed.Sheet drawing quality influence that resulted from punching velocity , fiction coefficient and press force w as discussed.The results show that the sheet in the adjacent area of cavity die and punch deforms firstly .The maximal value of stress and strain appears in the outboard sheet o f punch round corners .The maximal bodiness is sheet flange and the maximal attenuation is the sheet of cavity die round corners .The bigger fiction coefficient between punch and sheet is, the bigger the brim stress is.So the wrinkle isn' t easy to emerge in the rim of sheet.The effect of fiction coefficient on parietal stress is complex . Enhancing punch velocity properly can improve computing efficiency and assure computing precision.