Domestic waste classification and green lifestyle are not only concrete actions for everyone to participate in the construction of an ecological city，but also concrete actions that meet people’s needs for a better life. In 2019，Shanghai took the lead in implementing mandatory classification of domestic waste. After a year of participation by the whole people and full efforts，Shanghai has basically established a domestic waste classification system，and has made remarkable achievements in legal system construction and improvement of waste classification effectiveness. However，there are still problems to be solved. At present，the classification of municipal domestic waste in Shanghai is facing practical difficulties such as difficulty in reducing the source of domestic waste，difficulty in adapting waste disposal methods，and difficulty in collection and utilization of low-value waste. This is related to the unclear responsibilities of participants，insufficient motivation for green lifestyles，weak institutional incentives and constraints and low producer initiative. Therefore，Shanghai should further adopt a series of mechanisms such as improving laws and regulations，establishing interest linkages，improving reward and punishment mechanisms，strengthening government support mechanisms，and focusing on publicity and guidance.