Polycystic ovary syndrome (PCOS) is the most common gynecologic endocrine disorder in women of adolescent and reproductive age. Its etiology is still unknown and involves complex pathological mechanisms related to hypothalamic-pituitary-ovarian axis malfunction, adrenal gland dysfunction, genetics and metabolism. As a result, the clinical manifestations are diverse and vary widely among individuals. We will look at the clinical manifestations of PCOS from the following aspects. Patients with PCOS are unable to form dominant follicles due to neuroendocrine metabolic dysregulation, which causes atresia of the developing follicles, and thus no mature follicles are discharged, resulting in sporadic menstruation, amenorrhea, and infertility. The clinical manifestations are sporadic menstruation, amenorrhea and infertility. Specifically, menstruation cannot be established for 2 years after menarche, menopause for 6 months (or more than 3 previous menstrual cycles), menstrual cycle greater than 35 days and monophasic basal body temperature. 2. Clinical manifestations of hyperandrogenism Hirsutism, acne, seborrheic dermatitis, pore enlargement and androgenetic alopecia are common clinical manifestations and are likely to be the reason for adolescent girls to visit the clinic. Low levels of androgens are associated with the growth of axillary, pubic, and limb hair, while high levels of androgens are associated with hair on the face, areola, and lower abdomen. The presence of multiple acne in Chinese women for 3 consecutive months reflects increased androgen levels. It is worth noting that the appearance of coarse and long hairs on the lips, jaw, around the areola, the midline under the umbilicus, the pubic bone and the root of the thighs is considered hairy and reflects increased androgen levels. 3, obesity and endocrine disorders Obesity is a common clinical symptom of PCOS patients, and combined with many diseases of endocrine disorders, such as dyslipidemia, insulin resistance, fatty liver, etc., and endocrine disorders caused by obesity inhibit follicle development, ovulation, resulting in reduced fertility of obese women. 4, reproductive function abnormalities PCOS caused by infertility is anovulatory infertility, and ovulation promotion and IVF cycle pregnancy rate is also reduced, recurrent miscarriage, gestational hypertension syndrome, gestational diabetes increased risk.