Hysteroscopy is a surgical procedure for the treatment of diseases in the uterine cavity, which can also damage the lining. If the embryos are transferred in the same month, they will not be able to settle easily and there is an increased risk of miscarriage or ectopic pregnancy. It is also important to transfer as early as possible after hysteroscopy because uterine cavity lesions, such as endometrial hyperplasia, endometrial polyps and uterine adhesions, are prone to recurrence, and recurrence requires another hysteroscopy procedure, which increases the patient’s burden. Transfer can be arranged after one menstrual period after hysteroscopy, and the success rate of transfer can be improved after hysteroscopy. The success rate of embryo transfer is also related to the quality of embryos, timing of transfer, morphology and blood flow of endometrium, and the presence of comorbidities, so the timing of embryo transfer is considered comprehensively to ensure that patients are transferred within the best time.