Objective: To observe the clinical value of HD-Flow combined with spatio-temporal image correlation (STIC) in the diagnosis of velamentous cord insertion (VCI). Methods: A total of 56 cases of VCI diagnosed using HD-Flow and STIC were selected as VCI group, and healthy fetuses were selected as normal control group. Umbilical artery blood flow spectrum parameters were measured in two groups including S/D ratio, pulsatility index(PI) and resistance index(RI). According to postnatal results, compare the accuracy and feasibility of HD-Flow combined STIC technology in diagnosis of VCI. Results: There were 2 cases were confirmed after induction, 5 cases were confirmed as racket-shaped placenta after delivery. The parameters of the VCI group were slightly higher than the control group, but there was no statistical significant (P> 0.05). In 45 of 51 cases, STIC images of the umbilical cord placental insertion point were obtained, and this technique provided a stereoscopic and visual image for the diagnosis of VCI. The diagnosis coincidence rate of HD-Flow combined STIC is higher than two-dimensional combined HD-Flow. Conclusion: Therefore, HD-Flow combined STIC technology can be used to assist the diagnosis of fetal VCI, and this technique has important clinical value.