In order to solve the problem of increasing sludge volume in the process of oilfield sewage treatment，oily sludge filled gel particle flooding agent was prepared by oily sludge，acrylamide，silica sol，initiator potassium persulfate and methylene bisacrylamide. The temperature resistance，salt tolerance，viscoelasticity and plugging ability of the profile control agent were studied. Finally，the profile control agent was used in Zhongyuan oilfield. The results showed that the oily sludge filled gel particle could be produced locally，and the reaction could be carried out at normal temperature of 20—30℃ without reaction kettle. The reaction time was 1.5—2 h. The mixing effect of upper and lower sawtooth dispersing disc agitators was better than that of manual and blade agitators. The amount of sludge filled was up to 50%. Compared with ordinary gel particle，the oily sludge filled gel particle had higher temperature resistance，salt tolerance，viscoelasticity and plugging ability. The deep profile control effect on site of oily sludge filled gel particle was good，which made waste profitable，and provided technical support for improving oil recovery and reducing environmental pressure.