The multiparameter analysis has been used to predict the oil—water boundary of tom—plex fault blocks in the Xujiarea．In this analysis，one can make full use of various geophys— ical parameters(such as amplitude，frequency，phase and velocity)，combine various param— eters with geological factors，use the discriminant function to determine oil potentiality and then predict the oll—water boundary，thus eliminating the influence of local distortion OW— ing tO the use of a single parameter and increasing the dependability of the prediction．The prediction in the Xuji area has yielded good results．Therefore the multiparameter analysis is an effective and practical method for the early prediction 0f the oil—water boundary．