The main difference between a natural cycle and an artificial cycle is the source of the hormones. Natural cycle means that the patient has normal ovarian function and the ovaries are able to secrete estrogen, progesterone, folliculopoietin, luteinizing hormone, androgen, and lactogen, etc. periodically. These hormones act on the female uterus, causing the endometrium to proliferate, secrete, exfoliate and bleed periodically. If the patient is able to conceive normally, the levels of these hormones will rise again naturally to maintain the patient’s embryonic development. Artificial cycle refers to patients with abnormal ovarian function, reduced ovarian function, or other reasons that require the use of artificially added hormones, such as Glaxo and progesterone, to simulate the natural cycle of estrogen and progesterone, and the use of additives to promote menstruation, called artificial cycle.