Abstract: This paper introduces a new method to obtain the center and the diameter of Fabry-Pert interference fringes.A set of software is written with this method using Visual C++,which can obtain the center and the radius of Fabry-Perot interference fringes.Then the radius difference of the adjacent stripes is characterized by the use of classifiers for interpretation,and finally with VC++ developed into software and the purpose of automatic identification is realized with computer processing.