In IVF treatments, since multiple embryos are formed as a result of ovulation promotion, in order to make better use of the remaining embryos after the transfer, specialists freeze them and thaw them for application if needed at a later date. Frozen embryos have both advantages (e.g. increased transfer success rate, etc.) and disadvantages (e.g. expensive, etc.). 1. Advantages: Due to the good synchronization of embryo and endometrial development, the success rate of transfer is increased, which in turn increases the cumulative pregnancy rate of IVF treatment; it can effectively reduce the rate of multiple pregnancies and the occurrence of various pregnancy complications; the most important thing is that no more ovulation stimulating drugs and egg retrieval, which reduces the pain of drugs and egg retrieval, and also reduces the incidence of ovarian hyperstimulation syndrome. 2. Disadvantages: In the process of freezing and thawing embryos, additional costs need to be incurred, which will increase the financial burden of patients. It is recommended to follow the doctor’s advice to choose the right program for you according to your situation.