Abstract: Shortly after the injection of some injection wells in Bohai oilfield, the injection pressure quickly rose to the maximum injection pressure of the overall development plan, and the water injection could not meet the reservoir injection demand, which seriously affected the development effect of the oilfield. In this regard, the study on pilot test of pressure boosting and injection increasing,and the study of pressure drop funnel were carried out for the first time, which has determined the feasibility and reliability of the pressure boosting and injection increasing technology and has been applied in Kenli K oil field. By increasing the injection pressure at the wellhead,the small layer with higher start-up pressure starts to absorb water, the daily injection amount of the injection well increases obviously, effectively increasing the reserves for water drive, which plays an important role in improving oil recovery.