Abstract: In order to solve the problems of normal plugging agent such as plugging slowly, difficult to break down, expensive, complex to product, pollution, etc, the text researches and applies the temporary plugging agent with modified straw cellulose. The primary production, which have the character of irregular shape and different length through expanding the straw cellulose, rigidity particle and distortion particle constitute the agent(YQKD). The experiments indicate, The apparent viscosity and plastic viscosity of slurry improve 65.6% and 60.6% respectively when added 3% YQKD into it. The leakage of drilling fluids and plugging time decrease apparently when improve the mass of YQKD in 8% calcium slurry and shows the good and quickly plugging effect. The plugging fluids have not some bad influences. Also, the agent is a new green environmental protection material to plug the hydrocarbon reservoir.