Abstract: In order to accurately match the similar material that meets a certain permeability characteristics requirements of solid-gas coupling physics similar simulation test, taking sand, Portland cement, corn starch as raw materials, we design mass ratio of cement sand A, and the starch content B; factor A sets five levels,and factor B sets 6 levels, a total of 30 experimental ratio of the program; the self-developed small-scale permeability testing device is used to test different proportions permeability material. The results show that: K=ae^-bx meets the changing relationship between the specimen permeability and starch content, the mass ratio between sand and cement meets K=-clnx+d change relationship. The more compact of the rock composition and structure ,and the greater of the corresponding prototype rock strength, the lower of the permeability variation of high similarity.