Abstract: With high reservoir temperature, high degree of mineralization and loose cementation, characteristics of the exploration and development of the offshore oilfield is big cost, short service life of the oil platforms, high operating costs and low water flooding recovery and so on. Ho.w to improve the development effect of the offshore oilfield is a big technological problem. Aimed at the practical need of the development of offshore oilfield, combined with the geological and fluid characteristics of the reservoir, based on physical simulation experiment, a research on oil increase using polymer gel and polymer-flooding in the early exploration stage in LD10-1 oilfield is launched. The results show that early polymer flooding greatly shortens the oilfield development cycle, and saves costs; the ultimate recovery is higher than that of the polymer-flooding recovery in the middle and late stage. When the cost of chemicals is the same, the oil increase of ＂polymer gel ＋ polymer＂ flooding is better than that of the separate polymer flooding. LD10-1 oil field was firstly injected polymer gel in well A23 on March 23, 2006. Pilot test results show that the fluid entry profile of well A23 has been obviously modified and oil production of wells have increased.