Abstract: ［Abstract］〓Objective〖HTSS〗〓To analyze the predictive effect of ultrasonography on pregnancy outcomes of infertile women by observing the intraovarian follicle reserve imaging characteristics and endometrial receptivity of infertile women receiving controlled ovarian stimulation(COS) via ultrasonography.
〖HTH〗〖WTHZ〗Methods〖HTSS〗〓Retrospective  analysis the related data of 209 cycles were taken from infertile patients treated with COS. According to the pregnancy outcome, the cycles were divided into the pregnancy group(30 cycles) and the nonpregnant group(30 cycles randomly selected from the nonpregnant patients). The endometrial thickness, endometrial type, endometrial volume, ovarian volume, number of antral follicles and the maximum diameter of follicles before ovulation of both groups were compared. The 60 cycles were divided into group＜8 mm, group 8-14 mm, and group＞14 mm, according to the endometrial thickness; type A, type B, and type C, according to the endometrial type; group＜2 mL group 2-4 mL and group＞4 mL, according to the endometrial volume; group＜3 cm3, group 3-6 cm3, and group＞6 cm3 ,according to the ovarian volume; group＜5, group 6-15 and group ＞15, according to the number of antral follicles. The pregnancy rates of each group were compared.
〖HTH〗〖WTHZ〗Results〖HTSS〗〓The endometrial thickness and endometrial volume of the pregnant group were higher than those of the nonpregnant group. In the pregnant group，the endometrial morphology type A was in the majority, while in the nonpregnant group, the endometrial morphology type C was in the majority; the ovarian volume and the number of antral follicles in the pregnant group were significantly higher than those of the nonpregnant group, the differences above were statistically significant(P＜005). There was no significant difference in the maximum follicle diameter on the day of human chorionic gonadotropin injection between the two groups(P＞005). The pregnancy rate of the endometrial thickness 8-14 mm group was significantly higher than that of the group＜8 mm and group＞14 mm; the pregnancy rate of endometrial type A group was significantly higher than that of type B and type C; the pregnancy rate of endometrial volume＞4 mL group was significantly higher than that of group ＜2 mL and group 2-4 mL; the pregnancy rate of ovarian volume 3-6 cm3 group was significantly higher than that of group＜3 cm3 and group ＞6 cm3 , and the pregnancy rate of 5-15 follicles group was significantly higher than that of group＜5 and group＞15, the differences above were statistically significant(P＜005). 
〖HTH〗〖WTHZ〗Conclusion〖HTSS〗〓For infertility patients receiving COS treatment，the ones with endometrial thickness between 8-14 mm, endometrial volume greater than 4 ml, endometrium type A， ovaria volume between 3-6 cm3 and  the number of antral follicles between 5-15 are more likely to get pregnant.

Key words: infertility, female, pregnancy outcome, ovulation induction, ultrasonography