Abstract: In order to study the outsourcing mode selection and green transformation of fast fashion industry, Stackelberg game models led by fast fashion retailers are respectively established under OBM, OEM and ODM modes, when fast fashion retailers pay attention to consumer surplus. Reverse induction is used to solve the impact on product pricing and green degree decisions when fast fashion retailers pay attention to consumer surplus under three modes. The effectiveness of the conclusion is verified by a numerical simulation, and the corresponding management countermeasures are put forward. It is found that the level of product green degree is positively correlated with retailers' attention to consumer surplus, product initial fashion degree and sales cycle, and negatively correlated with the decline rate of fashion degree; when the green R&D cost coefficient is low, the sales price is positively correlated with the retailer's attention to consumer surplus, and vice versa; retailers pay attention to consumer surplus, which is always beneficial to consumers and has the greatest impact on the supply chain channel members of OBM mode, with ODM mode as the second, and OEM mode the least.

Key words: fast fashion, consumer surplus, green supply chain, outsourcing