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In stability analysis of rock soil engineering, before establishing similar physical simulation model, many match experiments on similar material are required, the current standard sample forming processes are difficult to satisfy the uniformity and compactness in the same sample set often, and have obvious defects in the molding process, molding efficiency and bedding processing. A pressing mechanism consists of adjustable concave-convex composite mould, multi-function trough, drive screw and framework is designed, the mould is pressed nto material to fill directly. Each layered material, dip angle, thickness and position can be controlled, forming number for each lot is adjustable, uniform of the same lot is good, all parts are detachable, operation is also simple. This mechanism is suitable for small batch forming, and has obvious advantages in bedding controlling, forming efficiency, forming quality and operation convenience, which can work well for match experiments before large-scale physical similar simulation experiment, geotechnical experiment, composite rock mass experiment, also can be used to make micro physical model with engineering structure.