Puts forward a method on positioning coordinate of five-wire resistive touch screen. The constant current is applied to inflow from four corners of lower conducting layer of the resistive touch screen and all current outflows from upper conducting layer. Sets the initial preset point first when the touch coordinate is positioned, then measures the actual diagonal voltage of the touch point, and uses the reverse-search positioning method to calculate the theoretical diagonalvoltage of the preset and searching point. Takes the theoretical minimum error diagonal voltage point as new preset point and searches repeatedly to get the final approach touch point. The method solves the problems of nonlinear equations solution and distortion calibration for five-wire resistive touch screen without the compensation electrode. It makes the touch screen frame narrower and broadens the five-wire resistive touch screen application range in small screen.