At present, the document about vector injection-production in high Water cut Oilfield mostly provides a qualitative or strategic conclusion, which lacks quantitative research and has certain limitations in practical application.In this paper, an evaluation method of volumetric sweep efficiency is established by using numerical simulation technique after isosaturation front surface is introduced to define volumetric sweep efficiency. Based on the evaluation method, a series of vector injection-production quantification research is conducted and relation charts between volumetric sweep efficiency and injection-production ratio are mapped out which offer a guide to inject and product.Research shows, for homogeneous reservoir, intensive injection and production provides a better development effect. The infilling horizontal well should produce on a high liquid level (600m3/d), the original water well should inject at a low injection-production ratio (0.5-0.75) and the new inverted water well should inject at a high injection-production ratio (corner well 1.2-1.4, edge well 1.0-1.2). The results of pilot well group in Bohai Oilfield indicate that vector injection-production could improve water flooding sweep efficiency and enhance the oil recovery, which has a great value of application and dissemination for those similar offshore oilfields after well pattern adjustment.