To accelerate the development of solar photovoltaic systems from land to sea， it is very important to master the hydrodynamic response characteristics of floating photovoltaic （FPV） under wave loads. In this research， the hydrodynamic response characteristics of a FPV under regular waves are studied based on computational fluid dynamics method（CFD）， and verified by physical model experiment. The results show that the surge and heave motion increase with the increase of wavelength when the wave height is constant and the wavelength range is 3-5 m. The maximum mooring force response of the floating photovoltaic platform also shows an increasing trend with the increase of wavelength under the condition of wavelet height， but the growth trend is gentle. The mooring force response of the platform increases significantly when the wave height is 0.2 m and the wavelength exceeds 4.5 m. The research shows the incident wave and the floating platform have obvious attack phenomenon when the wave steepness is large， and the action position is mainly concentrated on the buoy position of the floating platform. This study provides theoretical reference and data support for the design and optimization of offshore floating photovoltaic， which has very important scientific significance and application value.