Sustainability was first presented in 1972. It was how biological systems remain diverse and productive indefinitely. Long-lived and healthy wetlands and forests are examples of sustainable biological systems. Now, people do not only focus on economy but also focus on social, environment and culture. In this paper we try to find out how to build sustainability index based on customers’ perception of companies’ sustainable performance in fashion industry. The index was explored based on American Customer Satisfaction Index. Through testing the sustainability performance of fashion industry using sustainability index this study tries to find out how customers were affected by fashion companies sustainability performance and how to improve customer repurchase intention through sustainability performance.