【Objective】 To understand infant sleep problems through the study of infant sleep status in Shenzhen, and analyse the risk factors. To provide a scientific basis to solve infant sleep problems for pediatricians and children health care workers. 【Methods】 The survey and temperament tests were taken among 904 parents in five community service centers,at random. 【Results】 1) Prevalence of sleep problems among infants was 43.0% in Shenzhen. 2) The main infant sleep position before 6-month-old was supination. Lateral position and unfixed position gradually increased along with the growth after 6-month-old. Infants sleep on their own or need help to fall asleep had nothing to do with age. 3) Main risk factors were the parents lack of knowledge of sleep, infants with disharmonious temperament, infants sleeping at night with lights and so on. 【Conclusions 】 Infant sleep problems have attracted wide attention from their parents. The parents lack of knowledge of sleep and paying too much attention to infant sleep, is the main risk factor to prevent infants from establishing normal sleep patterns.