Abstract: Geotechnical model featured by vivid and visualized research method of rock physical and mechanical property is widely used in the field of geotechnical engineering both at home and abroad. In geotechnical model tests, the speed of accuracy of material ration selection plays a pivotal part to the success of the prototype. With the wider spread application of dynamical model in geotechnical model experience, the study of similar material ratio also converts its direction from statics to dynamics. Similar material is the mixture of aggregate and cement, and the change of their ratio exerts a great influence on the property of similar material selecting river sand as the aggregate, cement and plaster as the cementing agent. This paper studies the physics and mechanical property under different ratio conditions by the elastic wave speed simulation measurement and uniaxial compressive test. Experimental results show that on the condition that the cement or plaster alone serves as cementing agent and the amount of aggregate and cement remains constant, the mass, dynamic and static elasticity modulus of the specimen will climb up and then decline with the increase of sand-binder ratio, while when the mixture of cement and plaster serve as cementing agent and the amount of cementing agent and sand-binder ratio remain constant, the dynamic and static elasticity modulus of the specimen will decline followed by a climb with an increase of cement and plaster-use ration.