Improper operation during the deployment of artificial reefs (ARs) can result in some problems, such as collision damage, drop site faraway from target spot, etc.. In this paper, the deployment process of a frame-type AR in still water environment is studied. Based on the hydrodynamic model during subsidence and the colliding model between the AR and seabed, the existing impact force formula is amended, and the overall motion equations are developed. The numerical method is used to solve the ordinary differential equations to obtain the velocity and the impact force with different seabed stiffness. The results show that the impact force increases with the increase of stiffness. The multi-body dynamics software ADAMS is used to simulate the deployment process of the AR in different initial postures, and the strength analysis is carried out based on the finite element software ANSYS Workbench. The results show that the larger the initial angle is, the smaller the steady falling velocity is achieved; when an edge collides with the seabed the maximum impact force reduces compared to a surface, but it produces greater stress; and the maximum stress occurs in the middle of the colliding edges. This work can be a reference for the scientific design and deployment planning of artificial reefs.