Amphibious aircraft is a new type of aircraft that can travel on the ground and fly in the air.The culvert flying car studied in this paper generates the lift force through the main culvert propeller of the body,and the propelling propeller at the rear of the car generates the thrust to complete the lifting and advancing.ANSYS-CFX was used to simulate the flying attitude of the flying car in the air,and the parameters of the lifting force,rolling moment,pitching moment and yawing moment of the flying car were obtained.The flow field structure of the flying car in the forward flying state was analyzed,and the flying attitude of the flying car was analyzed in detail according to the numerical results.