OBJECTIVE To explore the correlative fators of nosocomial infections of preterm infants and decrease the infections rate of preterm infants.METHODS A retrospective analysis of nosocomial infection was made among preterm infants in our hospital from Jan 1998 to Dec 2005.RESULTS The incidence rate of nosocomial infections of preterm infants was 12.28%.The most infection site was respiratory tract.Small gestational age,low birth weight and birth asphyxia were the risk factors of nosocomial infections.CONCLUSIONS Intensive care of preterm infants and rational use of antibiotics are effective methods to decrease the rate of nosocomial infections.