Abstract: During oilfield development process, as the production of the reservoir and the deepening of understanding for oil layer, it is necessary to adjust the original well network to meeting the current production needs in some blocks. In order to further excavate oilfield potential, one test area of daqing oilfield was made a new adjustment by the ways of the subdivision of recombinant oil layer, infill drilling and injection-production system adjustment. According to the data of sedimentary phase diagram and perforation etc, water flooding control degree and the contact type between the sand body of oil wells and water wells are studied before and after the well network adjustment, the changes of control degree and contact way are analyzed, the contribution of different regulating methods to the degree of well pattern complete can be cleared.