Abstract: The SRM is needed to be tested, which is the mostly power equipment of the missile weapon system. Judging 2-D X-ray films of the SRM is the traditional method. It has many limitations on intuitive showing just using two dimension films because the SRM is 3-D object. 3-D reconstruction theory of the SRM by the two film images is studied in this paper. There have six parts: obtaining of digital images, demarcating of different parameter, pre-processing and feature extraction of digital images, feature matching, 3-D reconstruction of image’s information.