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Obiective To evaluate endometrial and Subendometrial blood flows measured by vaginal color Doppler ultrasound as a predicator of endometrial receptivity in women undergoing IVF treatment.Methods A total of 119 infertile patients undergoing the first IVF/ICSI-ET cycle were recruited.Three groups were divided according to a color Doppler ultrasound examination performed on the day of hCG injection.Group A,endometrial and subendometrial blood flows were 2 branches and below,group B,endometrial and subendometrial blood flows were between 3 and 4 branches;group C, endometrial and subendometrial blood flows were 5 branches and above.Patients were transferred 1-3 embryos each.Demographic data,ovarian responses.endometrial thickness,PI,RI,development of embryo and IVF result among groups were compared.Results Demographic data,ovarian responses,endometrial thickness,PI,RI and development of embryo among groups have no significant difference.The pregnancy rate of group A was significantly lower than that of group B(P＜0.05) and group C(P＜0.01).The implantation rate of group A was significantly lower than than of group C (P＜0.01).There was no significant difference of the rate of pregnancy and implantation between group B and group C (P＞0.05).Conclusion Endometrial and subendometrial blood flows measured by vaginal color Doppler ultrasound is a good predicator of pregnancy during IVF treatment.A good endometrial and subendometrial blood flows is benefit for the result of IVF.