On the basis of seismic data and vertical fault displacement method，the growth process of Xi’nanzhuang fault in Nanpu sag was quantitatively inverted. It shows that the boundary fault had the characteristic of segmentation in the early stage and jointed together in the later stage during the sag evolution period. The segmentation of the fault were apparent at the beginning of the depositional period of the Shahejie Formation，and each segment had individual distribution of normal fault displacement. During the depositional period of the first member of Shahejie Formation，the segments showed the trend of linkage and in the depositional period of the Dongying Formation，the segments finally linked together to become a large fault. It also reveals that the spatiotemporal diversity of Xi’nanzhuang fault segmentation has great influence on sedimentary system of rifted-basin and its distribution. The maximum fault displacement formed by segmentation is at the center of fault，and controlled the formation of half graben where nearshore subaqueous fans easily developed under the background of half-deep lake and deep lake. Meanwhile，the segmentation points located where the fault segments connected，and structural accommodation zones of strike slope and transverse anticline developed as the main channels for sand body being transported into the depression and thus facilitate the development of fan delta sedimentary system.