Background: With the improvement of living standards and the change of people's eating habits, the incidence of diabetes is gradually increasing. Self-management plays a key role in diabetes management. Peer support, to a large extent, can greatly improve patients' self-management ability.Aim: To describe the effect of peer support on self-management of patients with type 2diabetes.Design: a descriptive literature reviewMethod: This is a descriptive literature review. A total of 10 eligible articles were retrieved and screened in PubMed and Cinahl databases, including 10 quantitative articles.Results: Through the summary and analysis of ten articles, the author found that peer support is effective for self-management of patients with type 2 diabetes. Peer support can help patients better control their blood glucose, actively face the disease, reduce the difficulties of patients with diabetes, alleviate their negative emotions, control diet, exercise properly, etc. Through this series, patients with type 2 diabetes can better manage their diseases and improve their quality of life.Conclusions: Peer support has a positive effect on self-management of patients with type 2 diabetes. Through peer support, patients with type 2 diabetes can better manage their own diseases. Therefore, peer support is one of the effective strategies for self-management of patients with type 2 diabetes.Keywords: Peer support, Type 2 diabetes, Self-management.