Objective To investigate the obesity-related factors in the school-age children,and to provide a basis for proposed preventing and interfering measures. Methods Among the children with simple obesity,who were present at the pediatric growth and development clinic in the hospital from 2010 to 2011,86 (male 50,female 36) were randomly selected at the age of 7 to 18 years old,averaged 14 years old.Questionnaires were used in the 1∶1 matched case-control study,including such obesity-related factors as genetic factors,early feeding,dietary behaviors,learning and sporting and family environment.The obtained data were analyzed by univariate and multivariate Logistic regression analyses. Results It was shown in the Logistic regression analyses that the obesity-related risk factors in the school-age children included fast eating,liking to eat snacks and more family numbers with diabetes,and anti-obesity factors cover sporting and working mother. Conclusions As the high-risk factors identified in the study,both poor eating habits and family history of diabetes cause increased risk of obesity.This suggests that for the children at high risk due to family history of diabetes,special attention should be paid to dietary patterns and serious efforts taken to develop good eating habits and reduce exposure to such risk factors,in order to prevent the children from suffering from obesity.