The reservoir heterogeneity of Suizhong 36-1 oilfield in Bohai Sea is strong and the channeling flow in large channel is very common，which leads to the channeling flow of chemical agents along large channels during water flooding or conventional profile control. In order to improve this problem，polymer pre- crosslinked gel XD with composite crosslinked intercalation was prepared by using sodium bentonite，acrylamide，N，N- methylene- bis- acrylamide，chromium acetate，ammonium persulfate and thiourea as raw materials. The water swelling，viscosify capacity，strength，toughness and profile control effect of XD were evaluated，and the profile control mechanism of XD was analyzed. The results showed that XD expanded when it met with water and had good suspension and dispersion in water. The system had low initial viscosity and good injectability. XD had good water swelling property and controllable expansion time. After a certain expansion time，the viscosity of the system increased. The expansion multiple of XD after steeping 20 hours in formation water at 65 ℃ was about 8. The amide group with absorption ability gradually extended in water，which increased the viscosity of XD surface，but the integrity of the microsphere remained. XD had good strength and toughness before and after expansion. After the injection of XD system，the secondary water flooding could enhance the oil recovery by 15.7% on the basis of the primary water flooding，which met the deep profile requirement of reservoir with permeability greater than 3 μm2 or even higher