In this paper,the methods for processing data measured across faults and the results of their application to earthquake prediction are systematically introduced and summarized. A fitting method of deformed parameter with distinct period is presented. As. an example of Yanjiatai vertical base line,the method is proved to be practical for getting rid of noise and extracting the crustal deformation anomalies. The method and indexes for judging seismic three elements by using faults movement data are also presented,and based on them the problem of determining risky area is emphatically discussed.