Based on the curve of mill elastic deformation and the curve of strip plastic deformation, the influence of some factors on the strip exit gauge is analyzed.

It is made up of such six modules as an re-drawing coordinate system, cancelling the current curve, cancelling all the curve, drawing new curve, input parameters, exit window.

Practical divergent Angle is evaluated by the derivative of the standard wafer's grazing-exit X-ray fluorescence curve.