Objective To explore the language-social behavior of preterm infants and its influencing factors,to study the relationship between language-social behavior development and intellectual development,and to provide guidance for preterm infants'health care.Methods A self-administered general questionnaire was used to follow up 125 preterm infants until the age of 2 years,and Gesell development scale(GDS)was used to assess their language-social behavior and intellectual development.Results Preterm infants had normal language development in 43 cases(34.4%)and normal social behavioral development in 40 cases(32%).The mean language development quotient of preterm infants was(67.99±25.75)and the mean social behavioral development quotient was(67.75±23.98),which was at the low developmental level.There were no significant differences in gender,history of cerebral hemorrhage,regular follow-up,rehabilitation intervention,family intervention and language or social behavior(P>0.05).Infants with different fetal age history,gestational age,and birth weight varied significantly in language and social behavior(P<0.05);and with repeated miscarriage,small gestational age,low birth weight,showed poor language and social behavior development.Compared the children with and without moderate to severe asphyxia at birth,there was statistically significant differences in language development(P<0.05),but in social behavior there was no significant difference(P>0.05).The backward development of language-social behavior was accompanied by backwardness in gross motor,fine motor,and adaptive behavior in preterm infants,and the differences in the five major domains were all present and statistically significant(P<0.05).Conclusions A major of preterm infants have poor language-social behavior development,which may be accompanied by more motor and adaptive behavior development problems;children with poor language-social behavior development have repeated miscarriage prevention at younger gestational ages,lower birth weights,or a history of moderate-to-severe asphyxia during the fetal period.It is important to give timely attention to language-social behavior in preterm infants for early detection and early intervention to improve prognosis.