Abstract: In the cycle of frozen-thawed embryo transfer （ＦＥＴ）, natural cycle and hormone replacement cycle are the most commonly used for endometrial preparation. There is no disagreement on the necessity of luteal phase support in hormone replacement cycles. However, there are still no consensus on the necessity of luteal phase support in natural cycles, as well as the suitable drugs, dosage form and dose in natural cycles and hormone replacement cycles. There was not a conclusion on the effects of luteal phase support on the outcomes of FET. This review stated the luteal phase support in the cycles of FET, so as to improve clinical application of the luteal phase support.

Key words: Reproductive techniques, assisted, Fertilization in vitro, Embryo transfer, Cryopreservation, Receptors, progesterone, Frozen-thawed embryo transfer, Natural cycle, Hormone replace treatment cycle