Women who are abdominally obese increase the likelihood of infertility. One study found that for every 0.1 increase in the waist/hip ratio, the chance of conception decreases by 30%. Not only does the waist/hip ratio affect conception, but another important factor that can affect conception is polycystic ovarian syndrome (PCOS), which is almost a roadblock to conception. According to studies, obesity-related factors account for about 70% of non-organic infertility in women. The most common manifestation of polycystic ovary syndrome in obese women is: irregular menstruation, hirsutism, acanthosis nigricans, and infertility after marriage. One study reported that the infertility rate of obese women is about 76%. Such a high rate makes obese women pay attention to polycystic ovary syndrome and try to treat it by all means. Because there are several mechanisms for the development of polycystic ovary syndrome, some women will take herbs, acupuncture, hormones and other methods to regulate it, but the effect is often not obvious. Especially for obese women with polycystic ovary syndrome, facing the chance of infertility rate up to 76%, how is it good to treat polycystic ovary syndrome while wanting to treat obesity? What methods can be used to lose weight, treat polycystic ovary syndrome and conceive successfully? Polycystic ovary syndrome tends to cause irregular menstrual cycles and infertility, and most obese women have polycystic ovary syndrome, so it is important to lose weight in order to conceive successfully. Weight loss surgery will improve fertility. One group of data showed that weight loss surgery significantly improved the manifestations of PCOS such as irregular menstruation, hirsutism and infertility. The incidence of PCOS was reduced by 40%. In obese patients with PCOS, menstrual irregularities improved after bariatric surgery, while androgens decreased, sex hormone binding globulin increased, luteinizing hormone (LH) and follicle stimulating hormone (FSH) levels increased, and ovulation function improved. Studies have shown that patients with PCOS have higher pregnancy rates and lower miscarriage rates after weight loss surgery. 69 of 110 infertile obese patients became pregnant after surgery, and a decrease in BMI after surgery5 predicted an increased chance of pregnancy within the next 2.5 years.