【Abstract】 Objective To investigate the clinical value of ultrasonic examination of venous catheter in diagnosis of fetal congenital heart defects during 1114 weeks of pregnancy.Methods The fetal venous catheter spectrum and blood flow parameters were measured in 1800 fetuses at 1114 weeks of gestation, and the correlation between congenital anomalies and fetal congenital heart malformations was analyzed.Results Compared with fetal abnormalities of congenital heart anomalies, such as ventricular septal defect, transposition of the great arteries, single ventricle and permanent arterial trunk, Parameters S / D, PI, PLI and PVIV increased significantly. The blood flow parameters S, D, A and TAmax had no significant difference. The venous catheter spectrum and blood flow parameters in line with an exception are considered abnormal venous catheter, fetal group and abnormal vein catheter group, abnormal catheter group and fetal congenital heart malformations were significantly correlated.Conclusion Fetal venous catheter examination during 1114 weeks of gestation can detect fetal congenital heart defects at a relatively early time. It is widely carried out in the prenatal diagnosis center. It is essential for nonprenatal diagnosis center, especially in primary hospital.