Fourteen cases of endometriosis (Em) with infertility were studied by laparoscopy in our hospital from Dec. 1988 to Oct. 1989. 2 cases were minimal, 6 cases were moderate and 6 cases were severe. The salpingo examinations of 13 cases were normal by laparoscopy. There were no stigma on ovaries in 7 cases (LUFS). Levels of hormone (E2,P,LH,FSH) were compared in Em with normal women. The level of E2 during the follicle phase in Em was lower (86.4 +/- 6.9 pg/ml) than in normal women (119.9 +/- 7.7 pg/ml, P < 0.01). The LUFS group was compared with the no-LUFS group in Em. During the mid-late follicle phase and ovulatory phase, the E2 values in the LUFS group was significantly lower than in the non-LUFS group (P < 0.05), while the FSH value in LUFS group was significantly higher than in non-LUFS group (P < 0.05).