The invention discloses a deployment method of an offshore oilfield well pattern on the basis of equilibrium displacement. The deployment method comprises the following steps that 1, the reservoir displacement effect is maximized, and as for anisotropic medium reservoirs, the well distances in a certain direction can be adjusted according to the characteristic of the permeability to achieve the purpose of equilibrium displacement of an injected fluid; 2, adaptability of sand body distribution and the well pattern is determined; and 3, the well control reserve volume and injection-to-productionwell ratio are determined. According to the deployment method, the recovery efficiency of the reservoirs under different development scheme deployment is established, and the problem of oilfield wellpattern development is solved; and in addition, the technical support is provided for offshore complex river-phase oilfields to achieve equilibrium displacement and well pattern one-time forming, andthe problem that due to limitation of the platform space and the service life, the oilfield well pattern later-period adjusting is difficult is solved.