ObjectiveTo explore the value of prenatal ultrasound monitoring in the diagnosis and the treatment of the twin pregnancy complications.MethodsThe clinical data and ultrasound follow up medical files of 81 pregnant women with twin pregnancies were retrospectively analyzed during the study period (March 2011~April 2014).Twin to twin transfusion syndrome (TTTS) and selective intrauterine growth restriction(sIUGR) and other complications were comprehensively assessed, classified and monitored.All the cases were followedup until pregnancy has been terminated.ResultsAmong 81 cases of twins pregnancy, forty cases were dichorionicdiamniotic twins pregnancies (DCDA) in which one had intrauterine fetal death and one had disproportional growth; thirtyeight cases were monochorionic twins (MCDA) in which 4 developed TTTS, two sIUGR, one cleft lip in one of twins, one intrauterine death in one of the twins; Three cases were monochorionicmonoamniotic twin (MCMA) in which one was complicated with acardia in one of the twins and one with conjoined twins.DC twins complications are much smaller than the MC twins complications (P<0.05).The proportion of twins loss was 1/80 in DCDA and 11/82 in MC twins.DC twins fetal loss rate was significantly lower than MC twins fetal loss rate (P<0.05).Prenatal ultrasound monitoring was completely coincident with pregnancy termination results.ConclusionEarly prenatal diagnosis of twin pregnancy chorionicity has important clinical significance.Prenatal ultrasound monitoring once two weeks can early detect complications in MC twins at less than 26 gestational weeks.Determination of the time of divery in MC twins complicated by TTTS or sIUGR over 26 gestational weeks, the use by prenatal ultrasound monitoring could improve perinatal survival rate.