Objective To analyze the diagnostic value of echocardiography in fetus with congenital cardiovascular malformation(CCM) at different gestational ages.Methods The heart examinations were performed by echocardiography at three different phases:20 weeks ±7 days of gestational age(phase A),28 weeks ± 5days of gestational age(phase B),and 24 weeks ± 8days of baby phase(phase C).The positive results of the three phases were compared respectively.Results The incidence of positive diagnostic results of