Abstract: Aim at the low permeability reservoir characteristics of the Su 301 block in Hailar oilfield, a large well spacing and small row spacing rectangle well pattern integral fracturing water flooding field test is launched, through the artificial fractures and pattern matching, conductivity and permeability matching, profiles and reservoir thickness matching, fracturing fluid and reservoir properties matching, the overall effective use of block is realized. It is applied in 39 wells 98 formations, construction success rate reached 98.8% after pressure average single well oil production is 2.6 t, production strength is 0.41 t/d ·m, average single well water injection is 15 m3, which achieved production design requirements.