What should I do if I am not suitable for fresh embryo transfer after IVF egg retrieval? Can embryos be preserved? The answer is yes. The current method of preserving embryos is mainly vitrification freezing, where the embryos are put into a freezing solution and then kept in a dormant state by cooling them down. Currently, frozen embryos are usually kept in liquid nitrogen, mainly because the temperature in liquid nitrogen is constant and inexpensive and does not require high-end technical equipment. Embryo freezing is well established and is one of the most essential techniques for assisted reproduction. The current recovery rate of frozen embryos is generally above 90% and the cumulative pregnancy rate is over 60%. In fresh cycles, some patients will have multiple high-quality embryos, and freezing the excess embryos after transfer can effectively preserve fertility. Frozen embryos can be used for embryo transfer after thawing, which not only saves the patient the cost and time of ovulation promotion, but also eliminates the pain of multiple egg retrieval.