Methods: From October 2022 to September 2024, a total of 142 PCOS with T2DM patients admitted to Department of Endocrinology and Metabolism at the Affiliated Hospital of Nantong University were recruited. Participants are randomized in a ratio of 1:1 into two treatment groups of 71 participants: ① control group；②experimental group. After randomization, the control group was treated with lifestyle intervention+ metformin+ orlistat (obese patients)+ pioglitazone, and the patients in the experimental group were treated with lifestyle intervention+ metformin+ orlistat (obese patients)+ Chiglitazar (32mg QD) until the end of follow-up. The treatment and follow-up period totaled 3 months. Observe the body weight, menstrual cycle and blood glucose control and other related indicators. Type of study: randomized controlled, prospective, intervention study.