This paper describes a general ray tracing program. Both the program and the formula used in the program are given, the program traces only thirty-four light rays in four fields of view, it can calculate the spot diagrams of these four fields and the optical transfer functions of five focusing positions, four special frequencies and two azimuth space frequency distributions of the four fields of view. The program can evaluate the performance of an optical system accurately, it has traced fewer light rays and and obtain more useful informations.