The method of using Magic formula to calculate tire characterizing function is proposed. Identifying the Magic Formula coefficients based on the test data of tire performance test. Then, the tire handling parameters of arbitrary load and movement states can be calculated by the Magic Formula coefficients. The coefficients either can be used for handling performance synthesis, or can be used for the target of tire development. Take a tire characterizing function computation as an example to illustrate the usage of this method. This method improves the precision and efficiency of tire matching, has practical engineering significance.