In response to the serious leakage during the operation of low-pressure and high permeability reservoirs in Dagang Oilfield, and the difficulty of backflow after using leak prevention systems, This article establishes the “cork effect” temporary plugging theory, optimizes degradable bridging materials, and conducts multi-level particle size matching to increase the crack width of the temporary plugging system from 2 to 4 mm, At the same time, a series of supporting workover fluid technologies such as viscose-increasing fluid loss reducing agent and drainage aid are provided to keep the system’s filtration loss below 25 ml under a pressure of 3 MPa, and the degradation rate is over 92%, achieving the goal of high efficiency temporary plugging and fast backflow. At present, this technology has been applied in 153 wells in the field, with a temporary plugging success rate of 94% and significant application effects.