Abstract: Starting from actual demands of offshore development, in view of characteristics and existing problems of Nanbao 35 -2 oilfield,the applicability of weak gel flooding has been analyzed.Through laboratory analysis,the key parameters having influence on profile control such as crude viscosity, the timing and amount of profile control agent have also been analyzed.The laboratory analysis shows the lower crude viscosity and fewer amounts,the better profile control effect, and the best timing injection is 40%water cut.Based on the laboratory analysis,field implementation has been carried out.The facts prove the weak gel profile control has good effect on lowering apparent injectivity index,controlling water cut increasing and improving water flood effect.