Embryo freezing technology is a derivative of in vitro fertilization embryo transfer, because in the process of IVF, in order to guarantee the success rate of the patient, it is necessary to induce multiple follicles to develop, thus obtaining multiple eggs, so that the final embryos obtained will be several or a dozen, or even more. Embryo transfer usually involves selective transfer of 1-2 embryos, and all remaining embryos after transfer are discarded before the development of freezing technology, thus causing a great waste of embryo resources, i.e. once the patient does not get pregnant, a new round of ovulation, egg retrieval, etc. Therefore, the original purpose of establishing embryo freezing technology is to save the wasted embryo resources. With the development of IVF technology, embryo freezing technology has become more and more widely used in addition to freezing the remaining embryos for transfer, including patients who cannot be transferred in the egg retrieval cycle for various reasons, such as fever, unexpected events at home or work, and need to undergo PGT, commonly known as third generation IVF. In addition, patients with tumors that require fertility preservation can also have a portion of their embryos frozen before treatment of the tumor for future fertility after the tumor has healed, all of which are for married women, and for cycle transfer of donor eggs, frozen embryos can also be implemented.