【Objective】 To research the morbidity and the influencial factors of hyperactivity in children aged 3 to 6-year-old in Zhongshan. 【Methods】 Using stratified random sampling to choose children from kingdergardens of Zhongshan.Parents filled in the Conners Parent Symptom Questionnaire and background questionnaire.Univariate analyses and Logistic regression analysis were used to analysed the factors. 【Results】 The children from 66 pieces of kindergardens from 11 townships took part in the test.1 319 pieces of questionnaire were issued,while 12 804 pieces of questionnaire were withdrawed.The morbidity was 14.1%.Gender,age,living area,the education of parents,family income,living space,way of disciplining,the disease of neonatal period and the emotion and nutrition of pregnancy were the influential factors. 【Conclution】 In order to improve children's psychological development,the health education in those who got unfavourable pregnancy,who got the disease in neonatal period,and those family with low income,poor education of parents,despotic education and overprotection should be paid attention to.