Objective To explore the features of TCM syndrome elements in polycystic ovary syndrome（PCOS）. Methods Standardized to collect four diagnostic data of 100 PCOS patients， analysis of its syndrome elements characteristic by syndrome elements differentiation and statistical analysis. Results ①The main locations of disease in PCOS were liver， uterus， spleen， kidney and skin， liver and uterus syndrome were the most；②The main asthenia syndromes in PCOS was Yin deficiency， the integral of syndrome element of Yin deficiency was significantly higher than that of blood deficiency， Qi deficiency and Yang deficiency respectively（P<0.05）；③The main sthenia syndromes in PCOS were heat， Qi stagnation， blood stasis， phlegm， dampness， yang hyperactivity and blood heat. The integral of syndrome element of heat and Qi stagnation were significantly higher than that of blood stasis， phlegm， dampness， yang hyperactivity and blood heat respectively（P<0.01）. Conclusion The main locations of disease in PCOS were liver and uterus， liver-qi stagnation was the important pathological mechanism of PCOS.