In Bohai QHD32-6 oilfield，the heterogeneity of the reservoir is increasing，and the inefficient and ineffective circulation phenomenon is serious. In view of these problems，based on the reservoir rock and fluid of the oilfield as the simulation object，the new composite gel was prepared by using polymeric aluminum ferric sulfate，acrylamide，urea，initiator ammonium persulfate，crosslinking agent N，N'-methylene bisacrylamide. The dosage of each component was optimized，and the effects of shearing， formation water dilution，clay mineral，crude oil，acid solution and aging time on the gelling effect of composite gel were studied. The results showed that the components of the composite gel were arranged according to their influence on gelation time in following order：acrylamide>urea>polymeric aluminum ferric sulfate>initiator>crosslinking agent. The suitable formula of the composite gel was 3.4%—5.0% acrylamide，1.0%—3.0% polymeric aluminum ferric sulfate，0.4%—0.8% urea，0.04%—0.08% initiator and 0.01%—0.10% crosslinking agent. The initial viscosity of the composite gel was lower，but the gelation viscosity was higher，which indicated good injection and potential plugging ability. The composite gel had good resistance to dilute，shearing and oil，good stability and quick plugging removal ability. It was suitable for the profile control and plugging operation in heterogeneous oilfield.