For the working problems of laying head of high speed wire rod, choosing cubic spline function to fit the actual measurement data, the velocity and force model is used to analyze the state of the wire rod and research the curve´s effect on the laying head. On the basis of the consequence of calculation and the measured data, the bad working state is due to the sharply changed value of curvature of the pipe and the speed fast changing at the outlet of the pipe. By making some improvement on the space curve and bending processing of the pipe, the working state of laying head such as tail throwing is improved remarkably and the service life of single pipe doubles. The reform consequence approved that the theory model is correct and the renovation methods are reasonable.