In the computer-aided diagnosis system, the use of medical database data mining and knowledge discovery technology is of great significance and necessity of development. To understand the health status of left-behind children in ethnic minority areas, a questionnaire survey and computer-aided technology were used to diagnose and investigate the health status of left-behind children aged 6–12years in Xiangxi, Hunan Province, such as body shape, physical function and personal cognition. The comparison results show that the body shape, function a...