Under aqueous solution polymerization method,acrylamide and sodium acrylate as polymerization monomers, bentonite as filler,polyethylene glycol diacrylate and N, N'-methylene bis acrylamide as crosslinking agents, potassium persulfate and sodium sulfite as initiators. The effects of various factors on the properties of temporary plugging agent were investigated by changing the bentonite, crosslinking agent, initiator dosage and the neutr-alization degree of acrylic acid . The results showed that when the reaction temperature was 50℃, the amount of crosslinking agent was 0.02% (the percentage of monomer mass,initiator), the amount of initiator was 0.6%, the amount of bentonite was 5% (the percentage of total mass),80% neutralization degree of acrylic acid. the temporary plugging agent,which synthetised by this way, its rate of the water absorption was 158 g.g-1 and its dissolution time was 21 hours at 80℃. Sulfonated asphalt were added to improve the degradation rate of temporary plugging agent, the polymer characteristic group was measured by Fourier transform infrared spectrometer, and the form of temporary plugging agent was characterized by SEM. And the effect was observed by reservoir core plugging experiment.