From 2002 to 2010, after 8 years' research,we established 10 supporting technologies,for example, indoor screening and evaluating technology of new temperature-resistant anti-salt polymer, reservoir numerical modeling techniques for polymer flooding,polymer injection equipment and technology for offshore platform operations, large displacement polymer section injection technology under the conditions of preventing sands piecewise etc. These technologies were applied in Bohai Oilfield and showed obvious effects in increasing oil precipitation. The successful field tests in Bohai Oilfield indicated that polymer flooding supporting technology was the basis for the successful implementation of polymer flooding. It would make great contributions to the offshore oilfields development effectively.