After more than 50 years of development in Shengli Oilfield，waterflooding reservoirs have entered extra-high water cut period with 92.6% of composite water cut and 26.2% of recovery degree of reserves. The extra-high water cut and higher recovery degree require better water injection technology. The key of improving the quality of waterflood development is to improve the“triple rate”of the water injection. According to the constraints of“triple rate”and the analysis of the effects of separated layer water injection technology at early stage in the water flooding reservoirs of Shengli Oilfield，combined with the requirements of the waterflood development characteristics of different reservoirs，wells and working conditions，key technologies of improving the separated layer injection rate and the pass rate of the strata were researched to achieve the integrated support of standardized strings for different well conditions in different reservoirs. It was applied to the optimized water flooding blocks that have potential of improving“triple rate”with scale popularization. The“triple rate”indicator for the integrated oil reservoir，fault block reservoir and low-permeability reservoir was improved from the aspect of engineering，and the injection-production corresponding rate was further improved in the reservoir. The natural decline rate reduced and the waterflood development effect was improved.