Abstract: This paper discusses the application of pseudo-static method based on collaborative analysis in foundation dynamic state. This paper analyzes the relationship between the shear modulus and shear strain state of rock and soil, and transforms the force of the seismic forces to equivalent inertia forces. For different types of rock and soil, the relationship between shear modulus G and shear strain Y is difference. Earthquake process which is unpredictable can not be simulated. Research shows that it can get a more accurate calculation result, if using a linear approach to simplifies the process of seismic force decay. In this paper, it simulates these relationships with FLAC-3D, and also verifies the feasibility by engineering example. At last, it provides a method to calculate the spring stiffness parameters set in the dynamic state.