Abstract: It is all well known that war-field electromagnetic environment forecasting is important and necessary for the electromagnetic environment reflection of modern warfare vividly, which is significant for commanders' science decision. And we all know sea war-field electromagnetic environment that affected by natural and human factors is complex and dynamic. In this article, the prediction technology and the forecasting method of sea war-field electromagnetic environment were mainly discussed. What's more, that the forecasts system for sea war-field electromagnetic environment analysis was proposed based on the parabolic wave propagation model, after combining radiation models and factors which were affected wave propagation. Then, under the given sea battlefield electromagnetic environment a lot of simulation was done. The simulation results is closely to the results based on the model of Longley-Rice, and show that the electromagnetic environment forecasting method can effectively reflect the strength of electromagnetic environment of the specific location in the sea war-field, and provide guidance for commander.