To weaken the strength of the signals, a prediction method was presented. The electric field signal was decomposed into a low frequency signal and several high frequency signals. The high frequency part was predicted with auto regressive prediction model and the low frequency part was predicted with GM(1，1) model. The prediction result was the superimposition of the respective prediction. Based on the measurement at sea, the simulation results show that the prediction error of the electric field can be controlled within 20% of the amplitude of the signal.