Abstract: With the increasing demand for clean energy worldwide, how to optimize the renewable energy system to reduce the dependence on the traditional power grid is becoming increasingly important. An method for renewable energy system based on flow direction optimization algorithm (FDOA) is proposed, which dynamically adjusts the configuration of photovoltaic, wind and pumped storage minimize the grid usage factor and achieve the balance of load demand. The proposed method is verified to have advantages in optimizing complex renewable energy systems through comparison of 6 different configuration scenarios, can provide guidance for the design of future energy systems.