With the rapid growth of diabetes mellitus and the increase in women of advanced maternal age after the further relaxation of the fertility control policy,the prevalence of gestational diabetes mellitus (GDM) in China has been increasing annually,which is a serious threat to the health of mothers and their offspring. There is an urgent need to standardize the management of pregnant women with GDM and their offspring. The Diabetology Committee of Chinese Research Hospital Association has organized experts in the fields of endocrinology and metabolism,obstetrics and gynaecology,paediatrics,and nutritional sciences to co-write the Chinese Guidelines for the Co-management of Mothers and Children with Gestational Diabetes Mellitus (2024 Edition). The guideline consists of six chapters,including the significance of co-management of pregnant women with GDM and their offspring,diagnosis and screening of GDM,management programme for pregnant women with GDM,and management programme for the offspring of pregnant women with GDM,etc. The guideline emphasizes the importance and necessity of co-management of pregnant women with GDM and their offspring,and describes specific strategies for monitoring and management of pregnant women with GDM and their offspring. The promulgation of this guideline will provide physicians with practical and operable clinical guidance,thus greatly contributing to the comprehensive and full life-cycle standardized co-management of pregnant women with GDM and their offspring and promoting improvements in the short-and long-term health of mothers and their offspring.