This paper is based on the findings of shaking table test of underground caverns and the similarity principle. Proportioning tests of similar materials of surrounding rock are performed by taking advantages of the combination of orthogonal experiment and secondary refinement test. Iron ore powder, barite powder and quartz sand are the main materials. Gypsum powder is glue. Glycerin is regulator. The density, compressive strength and deformation modulus of the similar materials are chosen as the four control indicators in the orthogonal experiment. The importance of each factor is obtained using polar difference analysis method. The design of the secondary refining experiment is decided with the orthogonal experiment results. Tensile strength is additionally tested in the secondary refining experiment. The similar materials that satisfy the similar relationship can be developed efficiently with the combining test methods. The variation between the proportion of similar material and the physical parameters and the efficient method of combination test can offer a reference to model test of the similar project in which proportioning test of similar material is also required.