In order to obtain regression process of a wing-column grain's burning surface, the measurements of the grain were obtained by contact and non-contact reverse measure method, 3-dimensional model series of the burning grain was developed by 3-dimensional drawing method and parallel offset theory.The curve of burning surface fraction vs.depth ratio of burnt out grain was obtained by area query function of GAMBIT software and Matlab statistic program.The result shows that the burning surface of boost stage is about two times of the cruising stage, which is similar to propulsion force changing regulation during firing test, and verifies the accuracy of the reverse measurement and burning surface regression method.