Based on the analysis of the development of fast fashion brand and low carbon supply chain, this paper discusses the characteristics and connotation of low-carbon supply chain in fast fashion enterprise, and establishes the performance evaluation index system of low-carbon supply chain in fast fashion enterprise. Using data envelopment analysis（DEA）method to evaluate the performance of low-carbon supply chain and optimize the input and output; The study shows that the fast fashion model brings heavy environmental cost, without sustainable development, The establishment of fast fashion enterprises low carbon supply chain play an important role in energy conservation and sustainable development of enterprises. The existing supply chain network can use DEA and other scientific methods to achieve input and output optimization.