Abstract: To further improve the prediction accuracy of the downhole formation pressure,the method of B-P network was investigated for formation pressure prediction.The focus was on the selection and modification of the determining method and algorithm of the reasonable network structure,etc.,and a B-P algorithm was built for suitable formation pressure prediction.The specific application procedures of B-P network in formation pressure prediction was described,taking the time delay prediction of acoustic wave in the bottom formation as an example,and its field application results were also verified.The study results showed the advantages of this method,e.g.,high prediction accuracy,good self-adaptation,and good error tolerance,etc.