The prevalence of obesity and type 2 diabetes(T2DM) which arise from the social lifestyle changes and the improvement of people’s living standard,continues to rise worldwide causing serious health problems. Weight management is beneficial in the treatment of T2DM,since weight loss can improve glycose control,improve insulin resistance and reduce the need for anti-glucose-agent. Therefore,weight management plays an important role in the prevention and treatment of T2DM. 2018 American Diabetes As-sociation(ADA) Standards of Medical Care in Diabetes and 2017 China Guideline for Type 2 Diabetes re-emphases the importance of weight management in the treatment of T2DM,and provides a new strategy for weight management in T2DM patients concerning lifestyle intervention,medical and metabolic surgery.