Objective To investigate the potential impact of intrauterine perfusion of embryo culture supernatant before frozen-thawed embryo transfer (FET) on pregnancy outcome. Methods From March to December 2019, a total of 198 FET cycles were enrolled for the present study.Patients were divided into two groups: the study group included 93 cycles, patients in this group received intrauterine perfusion of embryo culture supernatant four weeks and one day before the embryo transfer, respectively; the control group included 105 cycles, and patients in this group did not receive intrauterine perfusion. Rates of implantation, pregnancy, and miscarriage were compared between the two groups. Results The implantation rate in the study group was higher than that in the control group (P<0.05). There were no significant differences in clinical pregnancy rate and abortion rate between the two groups (P>0.05). Conclusion With the performance of intrauterine perfusion of embryo culture supernatant before embryo transfer, the implantation rate may be improved in FET cycles.