Abstract: Zhongyuan Machang Oil field M11 block is a complex depositional structure, and has entered into extra high water-cut period. Aiming at its features and difficulty, a geological model for numerical simulation was established, and on its basis the distribution of remaining oil and refined oil reservoir numerical simulation had be researched. It analyzed the producing state of the oil reserves and distribution of the remaining oil in the horizontal and vertical position, determined 5 main types of remaining oil distribution, and put forward some available adjustment measures which obtained a better yield results.