Objective:To analyze the causes and complications of prematurity in hospital premature infants in the past 6 years in order to offer some clinic evidences for health protection in perinatal periods.Methods:The data of premature infants in hospital from 2002 to 2007 were reviewed.Results:The fatality rate of premature infants in hospital showed an obvious decrease.Among the prematurity causes

the incidence of fetal distress and social factor decreased

premature rupture of membrane

Cholestasis of pregnancy and multiplets increased.Among the complications

the incidence of septemia

hypoxic ischemic encephalopathy(HIE)

pneumorrhagia and scleredema decreased

transient tachypnea

hyperbilirubinemia

hypoglycemia and acidosis rose.Conclusion:The incidence rate of low gestation age and very low birth weight infant increased.The fatality rate of those infants obviously decreased.The incidence rate of some complications decreased.