Taking a complex water drive reservoir as the primary research object, the uncontrolled reserves caused by static and dynamic factors, a sophisticated numerical model of the reservoir is constructed through the applications of numerical simulation technology, combined with high-precision dynamic monitoring, a dynamic data monitoring technology is constructed, to realize re-understanding of oil reservoir geology, re-understanding of water drive, re-description of remaining oil, to clarify the misunderstanding of geological understanding after a complex water drive. On the basis of re-understanding the laws of oil–water movement and remaining oil enrichment law in dynamic reservoir, the secondary development and deployment of reservoir are proposed, reconstruct the underground cognition system, reconstruct the well pattern structure, reorganize the surface process, explore the development experiments of various well-type at the same time, and the application of solidified mature technology, form the development and adjustment technical model adapted to the reservoir, the application effect of oilfield has been proved by practice.