According to the Code of Assisted Human Reproduction Technology formulated by the Ministry of Health, the total number of embryos transferred per cycle shall not exceed 3, and the number of embryos transferred for the first time for women under 35 years old shall not exceed 2. At present, it is more common for China’s fertility centers to transfer one or two frozen embryos at a time. How many frozen embryos can be transferred at one time is related to the number of frozen embryos, the woman’s physical condition, etc. Nowadays, most of the frozen embryos are transferred one or two at a time, which can ensure the success rate of IVF and avoid the risk of multiple pregnancies. With the development of technology, single embryo transfer is a trend, and ultimately how many frozen embryos can be transferred at one time needs to be combined with the actual situation, not just how many you want to transfer, it can be decided by the fertility center for the actual situation. It is recommended to pay attention to rest after the transfer, avoiding exertion, to improve the success rate of pregnancy.