Abstract: A parameter equqtion has been introduced to the boundary slip line in the Drawing deformed zone with a fractional reduction ε=(H-h)/H=2sinθ/1+2sinθ and a distributed function of hydrostatic pressure P has been obtained using integration by substitution. An example for semicone angle of die θ=30° has been calculated by this method. It has been shown that the results from this method are the same with those from the conventional solution.