A simulation system for helicopters is established in MATLAB/SI MULINK platform, and the flight simulation test of a UH-60 helicopter considering the non-ideal noise is implemented. A mathematical model of the non-ideal noise is built, and a comprehensive identification method is designed based on the recursive extended least squares which can identify the model parameters and noise parameters simultaneously. The identification and verification of the longitudinal flight dynamics model of a UH-60 helicopter are realized by using the simulation test data. Finally, the proposed method is compared with the least square method. Results prove the superiority of the method.