According to the development requirements of a certain type of helicopter flight teaching and training simulation system, a general helicopter flight dynamics simulation modeling method is proposed. Based on the momentum-blade element theory, an iterative calculation method for the lift and induced velocity of the main rotor of a helicopter is given, and the dynamic model of the induced velocity is introduced, and the first-order flapping equation of the main rotor is constructed. The aerodynamic modeling methods of the fuselage, wing, tail rotor, horizontal tail and vertical tail are given respectively. The simulation examples are constructed, and the thrust of the main rotor and the dynamic response of the model are simulated and analyzed. The results show that the method is reliable, accurate and real-time.