A game model between an original equipment manufacturer ( OEM) and a remanufacturer is established in order to analyze the effect of design for remanufacturing ( DfＲ) on manufacturing /remanufacturing supply chain competition under the outsourcing remanufacturing pattern． Moreover，based on the game model，the effect of different DfＲ cost sharing modes on the DfＲ effort level，the collection rate of used products，benefit and environmental impact is analyzed． The main research results are as follows: through outsourcing remanufacturing，the OEM could not only reduce the market competitive advantage of the remanufacturer，but also increase its benefit; DfＲ could promote the remanufacturer to collect used products and thus improve the collection rate of used products; whether the OEM or the remanufacturer covering the DfＲ cost，both benefits are maximized at certain different DfＲ effort levels，in other words，the greater effort of DfＲ does not always bring the greater benefit; remanufacturing does not always reduce environmental impact，and it is more environmental friendly only when the ratio of environmental impact for unit remanufactured to new products is less than a certain threshold，and the ratio of the DfＲ brought benefit for unit remanufactured to new products is greater than a certain threshold．