Egg freezing technology is not yet mature and the quality of eggs frozen for many years cannot be guaranteed after thawing. When a woman has her eggs retrieved early, the ovulation promotion and retrieval process can cause damage to her body, such as ovarian hyperstimulation, ovarian torsion, ovarian hydrosalpinx, etc. In ovulation promotion, drugs are required and each person has different sensitivity to drugs. In patients who are more sensitive to drugs, ovarian hyperstimulation can be caused, causing symptoms such as ascites and electrolyte disturbance. Premature fertility preservation and egg freezing for the sole purpose of obtaining high quality eggs is more than worth the cost.