Abstract：【Objective】To investigate the feasibility of screening for velamentous umbilical cord insertion in early pregnancy by ultrasound.【Methods】A total of 2，796 cases of pregnant women，2 998 cases of fetuses that underwent prenatal ultrasound screening in the early and middle stage pregnancy and delivered in Dalian Women and Children Healthcare Center were included. The results of ultrasound screening of umbilical cord insertion during early pregnancy（11 ~ 13+6 w）were divided into three groups. Group Ⅰ：it is clear that the placenta of the umbilical cord is located in the fetal membranes，and then along with the fetal membranes for a long distance，and then enter the placenta. Group Ⅱ：The placenta of the umbilical cord is located at the edge of the placenta，and then insert point is not distinguished between the placenta and fetal membranes. Group Ⅲ：It is clearly shows that the umbilical cord inserted into the placenta.【Results】1. The display rate of the umbilical cord in early and mid pregnancy ultrasound examinationearly pregnancyan examination showed that the rate of 99.23%（2 975/2 998）. The single child display rate of 99.77%（2 590/2 596），twindisplay rate of 95.96%（380/396），three fetal the rate of 83.33%（5/6）.In the second trimester of pregnancy（22 ~ 26 w）and examination showed that the rate of 86.99%（2 608/2 998）. The single child display rate of 90.99%（2 362/2 596），twin display rate of 61.61% （244/396），three fetal the rate of 33.33 %（2/6）. 2. The results of early pregnancy，pregnancy，the examination of after birth Regard? ing to early pregnancy，28 cases were included in Group Ⅰ，42 cases in Group Ⅱ and 2928 cases in Group Ⅲ. Regarding to second pregnancy，37 cases were evaluated as velamentous umbilical cord insertion，30 cases were evaluated as battledore placenta and 2931 cases were evaluated as normal placenta. The results of postnatal examination were as follows：36 cases were identified as velamentous umbilical cord insertion，30 cases were evaluated as battledore placenta and 2932 cases were evaluated as normal placenta. 3. Comparison of 3 groups，early pregnancy examination results and pregnancy and after the birth. In early pregnancy，28 cases of GroupⅠ were diagnosed as velamentous umbilical cord insertion in the examination during the second trimester of pregnancy and after delivery. In the 42 cases of early pregnancy in Group Ⅱ，7 cases were diagnosed as velamentous umbilical cord insertion，22 cases were diagnosed as battledore placenta and 13 cases were normal placenta. After birth，6 cases were diagnosed as diagnosed as velamentous umbilical cord insertion，23 cases were battledore placenta and 13 cases were normal placenta. In the 2928 cases of early pregnancy of Group Ⅲ，2 cases were diagnosed as diagnosed as velamentous umbilical cord insertion，8 cases were battledore placenta and 2918 cases were normal placenta. After birth，2 cases were diagnosed as diagnosed as velamentous umbilical cord insertion，7 cases were battledore placenta and 2919 cases were normal placenta.The diagnostic accuracy of early pregnancy was 98.29%. 【Conclusion】Application of HD-Flow blood flow pattern in early pregnancy can make a diagnosis of some of the sail-shaped placenta.