Abstract: Based on the observational facts and correlative study results about the equatorial SST and Subtropical High, a prediction model between West-Pacific Subtropical High and equatorial SST is established by using the BP neural network model and its improved calculation method. By using this model, we can predict Subtropical High's basic changes and trend ahead of 3 months according to the early data of equatorial SST and subtropical high. This prediction model has better coupling precision. The forecasting accuracy and valid time of this model are meaningful in application.