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To study the mechanics and permeability characteristics of similar material of solid-gas coupling, orthogonal test is used to make up similar material which using river sand as aggregate, paraffin as cementing agent and hydraulic oil as regulator. Adopting range analysis and multivariate regression analysis, the influence of impact number, aggregate size, oil content and cement-sand ratio on the compressive strength, elasticity modulus, Poisson's ratio and permeability of similar material are investigated. The test results show that the size order that factors against compressive strength is oil content, impact number, aggregate size, and cement-sand ratio. The size order that factors against elasticity modulus is oil content,impact number, cement-sand ratio and aggregate size. The size order against permeability is impact number, cement-sand ratio, oil content and aggregate size.The factors have less influence on Poisson's ratio. The compressive strength and elasticity modulus of similar material is positively related to impact number and aggregate size, and is negatively related to oil content and cement-sand ratio. The permeability is negatively related to impact number, aggregate size, oil content, and is positively related to cement-sand ratio. Poisson's ratio has no obvious relationship with the factors. The comprehensive model of characteristic parameters of similar material is obtained under the influence of four factors in test. [ABSTRACT FROM AUTHOR]