To study the regulation of oil-water distribution and the characteristic of development status,reservoir engineer may find the measures to enhance oil recovery.As one of the effective methods to analysis the reservoir remaining oil,the reservoir simulation developed quickly.With the software and hardware improvement of computer,it become mature at the researching theory and manner.The way shows great values contrast to other behavior researching methods.While the reservoir numerical simulation technique is an efficient manner for the development adjustment scheme of an oilfield in extra-high-water-cut stage.