Obesity is an important public health problem, which is directly related to the risk of childhood complications and the increase of incidence rate and mortality of adult complications. The consequences are more serious than malnutrition such as low weight. Since the 1980s, the obesity rate among children in China has gradually increased. Currently, overweight and obesity are important health issues for children in rural and urban areas of China, with obesity rates in many large cities approaching or exceeding those in developed countries. The Report on Nutrition and Chronic Disease Status of Chinese Residents (2020) shows that the overweight and obesity rate among children aged 6-17 in China has approached 20%, with 10% of children under 6 years old. The imbalance between energy intake and expenditure is the direct cause of individual overweight and obesity. The 2021 Healthy Children Action Plan (2021-2025) explicitly requires the implementation of early screening, early diagnosis, and early treatment prevention and control strategies for risk factors such as obesity that seriously endanger children's health, reducing disease burden, promoting children's health, emphasizing the principle of prevention first and combining prevention and treatment. Given the current status of children's nutrition and health in China, it is an urgent need to establish a standardized and regulated monitoring and management system for obesity and overweight in preschool children, as well as service standards, for the development of children's health. This project aims to establish a complete prevention, improvement, and intervention promotion plan for obesity and overweight in preschool children, as well as a comprehensive monitoring and management system that combines medicine, education, home, and community. It will strengthen children's nutrition feeding and exercise guidance, reduce sedentary time, promote food and movement balance, and prevent and reduce childhood overweight and obesity. Provide children with comprehensive, full process, and warm children's healthcare clothing, and provide small-scale policy research references for the implementation of support systems for children's nutrition improvement projects.