The endometrial antigens from human endometrium were purified by collagenase (Type I), 250um, 40um, sieves and affinity chromatography. Indirect ELISA was used to detect antiendometrial antibodies (EMAb). The findings showed that the positive rates of EMAb in this assay were 43.4% (infertile, n=129), 37.1% (abortion, n=113), 6.7% (middle and old man, n = 120), 3.8% (pregnant woman, n = 52) and 0% (male, n = 43), respectively.