Abstract: Up to now,serious heterogeneity has existed in the ma-jority of the Bohai oilfield water injection wells injecting layers. Using conventional technology general acidification,acid only enters to the better absorbent layer,which improved only a few small layers,non-absorbent layers orlow absorbent layers have small or even no improvement. Temporary shunt plugging acidification technology has been applied for such injection wells. Water-soluble temporaryblocking agent SZD-01,temporarily blocking the rate of more than 97%,more than 95% water-soluble rate,core permeability recovery rate is greater than 95%. The application of injection wells in Bohai oilfield has proved that thetemporary blocking agent can effectively control the acid absorption strength of different acidification position and adjust the formation water absorption rate to even absorption.