In the middle-high permeability sandstone oilfield with strong heterogeneity，invalid recycling of the injected water is formed along the natural high permeability belt at high water cut stage due to the development and geological reasons，which results in poor implementation of tapping the potential of remaining oil. Therefore，identifying the predominant streamline field accurately at this stage is very important for taking effective measures to control the predominant streamline field and tap the potential of remaining oil. A certain block in Shuanghe oilfield at high water cut stage was researched.Judging criterion for predominant streamline field was made through fuzzy comprehensive evaluation and streamline numerical simulation technology. Injected water volume and efficiency of the injection wells in single well group were determined in different affected directions to response well through streamline distribution，injection-production allocation factor and injection efficiency between oil well and injection well in each layer. Rule of plane distribution of the predominant streamline field between oil well and injection well in the studied area was studied qualitatively and quantitatively. Until October 2015，composite water cut of the studied area had dropped by 1.5% and the cumulative incremental oil had been 3.15×104 t and the recovery had been improved by 1.2%. Good effect of stabilizing oil and controlling water cut had been achieved since vectorization adjustment of variable streamline was made in the field in June 2013.