Abstract: The position stability plays an important role in the power generation efficiency and production safety of photovoltaic power plants. Floating array of photovoltaic power station is prone to move and rotate under the action of wind, wave and current, which could be effectively limited by multi-point mooring system. In this paper, the static analysis method is adopted to study the tension of the mooring cable and the displacement of the square array restrained by the multi-point mooring system. The laws between tension, shifting displacement and horizontal span and mooring density were obtained, which provide reference for the design of floating square multi-point mooring system.