The bottom axis-driven flap gate, as a novel type of river landscape gate, is widely used in river conservancy projects due to the ecological benefits it brings forth. However, it is only put into service for a short time, the structural design theory is not yet fully developed, and there are few references on the finite element calculation research of the gate. In view of this, the numerical simulation methods of the bottom axis-driven flap gate was summarized focusing on its static and dynamic characteristics. Taking a project as an example, the static and dynamic characteristics of the bottom axis-driven flap gate structure under the action of water pressure was investigated using the numerical calculation method of CFD-CSD coupling. Firstly, the water pressure of the gate under different opening conditions was numerically simulated, then the water load calculated by unidirectional fluid-solid coupling method was applied to the gate structure, based on which the changing trend of the stress and displacement of each component of the gate with the changes of opening degrees was analyzed. Meanwhile, the dry and wet modes of the gate structure were analyzed to study the influence of water in front of the gate on the natural vibration mode and frequency of the gate. The analysis results show that the stress and deformation of each component reached the maximum value in the full closure condition, the maximum stress reached 200.79 MPa, and the maximum displacement value was 47.703 mm, which gradually decreased with the increase of the gate opening degree. In addition, the natural vibration characteristics of the gate was significantly affected by the water in front of the gate. Therefore, the fluid-solid coupling effect should be considered when studying the dynamic characteristics of the gate.