Objective To study the features of ultrasonographic parameters and endocrine profile in patients with obese polycystic ovary syndrome(OB-PCOS) andnon-obese PCOS．Methods 56 women with PCOS were divided into OB-PCOS and NOB—PCOS groups．The ultrasonic parameters such as follicle number,ovarian volume,resistance index and pulsation index were detected and compared between two groups,and Serum levels of luteinizing hormone(LH),follicle stimulating hormone(FSH) and estradiol(E2) were also measured and compare．The correlation of the ultrasonic parameters and hormonal factors were analyzed. Results The follicle number, ovarian volume, RI and PI of OB-PCOS were significantly higher than those of NOB-PCOS,and the LH and FSH were significantly Iower than those of NOB-PCOS(P<0.01)．In OB-PCOS group, all the ultrasonographic parameters was non-significantly associated with endocrine index,however, in NOB-PCOS group,PI was significantly associated with FSH(r=0.405,p<0.024). Conclusions The Characters in ultrasonography and endocrine parameters between OB-PCOS and NOB- PCOS patients were different.