Abstract: A simplified calculation model and a parameter optimization method are proposed for the seismic response analysis and for the optimization design of complicated oblique connected structures. Firstly, according to the composition and to the mechanical characteristics of the oblique connected structure, presented are the simplified calculation model and its calculation method of the series-parallel rigid-mass system considering the influence of nonlinear viscous damping. The comparative analysis with the finite element method shows that the simplified model can accurately simulate the dynamic behavior of the oblique connected structures with high efficiency and applicability. On this basis, the frequency domain optimization analysis of the frequency ratio between the connector and the tower is carried out by using the simplified model. The damping mechanism of the oblique connector to the tower is revealed, and the optimal frequency ratio is identified. Finally, through a time history analysis, explored is the influence of connection parameters such as connection stiffness coefficient, damping coefficient and damping index on the damping effect of oblique connected structures. The research findings provide a reference for the damping analysis and for the optimization design of oblique connected structures.