Abstract: Based on the title C data of 2013 National College Mathematical Modeling Contest, a method of eight shape barycenter coordinate fitting to define the old Tower' s home position was advanced, and MATLAB was used to compute every layer's kernel coordinate. The gradient was got from the tilt displacement between top and ground floor. Using the layer tower coordinate fitting curve to describe the bending curvature. An assumption of using the same test point and tower line of torsion angle to describe the tortuosity was advanced.