The lift fan is one of the core components of short-range/vertical take-off and landing of short-draped fighters, which has important application value in the aviation field. The thrust, efficiency, and power of two different types of lifting fans are studied based on CFX software, and the flow field characteristics of two-stage lift fans under hover are revealed. The first configuration is initially designed with a rotary culvert with an outer diameter of 450mm, including inlet and outlet guides. The rotor blade adopts an S-type airfoil to reduce the shock resistance caused by excessive rotational speed. The hub shape is cylindrical. The second configuration adopts a subsonic airfoil with a diameter of 240mm, a thrust of 1002N, a power of 50.8kw, and an entropy compression efficiency of 0.82, which meets the requirements of design indicators. The simulation results show that, the design requirements are met by adopting a subsonic airfoil for the lifting fan blade. The advantage of the culvert fan is that the aerodynamics of a single blade are smaller than that of single-row blades, and the double-row rotors can offset the reverse torque, and the mechanical balance is better.