Aeromagnetic exploration is an essential issue in the geophysics. The data measured by optically pumped magnetometers (OPM) is seriously affected by the interference magnetic fields generated by the aircraft. Therefore, aeromagnetic compensation is very essential, and a nonlinearity aeromagnetic compensation method is proposed. Firstly, the weighted signal sequences are used to predict the output of the sensors. Then, LevenbergMarquardt (LM) algorithm is utilized to realize aeromagnetic compensation. The simulation results show that the nonlinearity aeromagnetic compensation method is effective to the interference magnetic fields caused by the delay between the sensors. The standard deviation of the compensated signal is decreased to 10－4nT/m. The residual error of the compensation signal is the same order as the noise floor of the OPMs. The proposed method can be applied to obtain highquality aeromagnetic survey data. A field experiment is carried out to prove the validities of the theoretical analysis and the simulation results.