1. Polycystic ovary syndrome type I PCOS type I is mainly hyperandrogenic, mainly caused by abnormal expression of P450c17 enzyme. According to the clinical manifestations and androgens mainly from ovaries or adrenal glands, there are two types: ①Polycystic ovary syndrome type Ia. 2.5, with elevated PRL levels in a small proportion of patients. PCOS Ib androgens mainly originate from the ovaries and adrenal cortex, amenorrhea is the main clinical condition, most of them are 155 cm tall, obese, with “buffalo shoulders”, skin lines and hairy lower abdomen or outer thighs, rough skin pores on the thighs, long hairy calves, and not much acne. In addition to elevated blood androgens, 17α-OHP and cortisol are also elevated, LH/FSH≤1, and blood leptin level is elevated. 2. Polycystic ovary syndrome type II PCOS type II, hyperandrogenic and hyperinsulinic, is the main type. PCOS IIa is characterized by amenorrhea, hyperphagia, hirsutism, marked centripetal obesity, melanosis or acanthosis nigricans in the axilla, back of the neck and vulva, family history of hypertension or diabetes, dry mouth, irritability, elevated blood testosterone, low estradiol, LH/FSH ≤1, normal glucose tolerance test, markedly elevated fasting insulin, and elevated leptin levels. (ii) Polycystic ovary syndrome, elevated blood leptin levels. (2) Polycystic ovary syndrome type IIb. PCOS IIb with persistent amenorrhea, hirsutism, hyperphagia, visible acanthosis nigricans, family history of hypertension and diabetes mellitus, no dry mouth, elevated blood testosterone and 17α-OHP, ovarian ultrasound showing small follicles with significantly increased interstitial volume, normal glucose tolerance and elevated fasting insulin. According to Chinese standards, the staging of PCOS focuses on 3 aspects: ① the presence of obesity and central obesity. ② The presence or absence of impaired glucose tolerance, diabetes mellitus, and metabolic syndrome. (iii) The presence of hyperandrogenism. The focus of staging is mainly on metabolic aspects. PCOS patients can be classified as classic (with menstrual abnormalities and hyperandrogenism, with or without PCO) and non-hyperandrogenic (with menstrual abnormalities and PCO only) according to the presence or absence of hyperandrogenism, and the significance of PCOS typing is to guide clinical interventions.