Objective To study the effect of small dose mifepristone in the treatment of uterine fibroids.Methodsfrom January 2013~2015 year in January 100 cases of uterine fibroids were treated in Yiwu Maternal and Child Health Care Family Planning Center as the research object in the course of the study, patients began taking mifepristone in menstruation third days to 5 days, taking a total of 6.5 months, after the observation of its long-term use of low-dose mifepristone after treatment, changes in sex hormone the level of the effect of low-dose mifepristone in the treatment of patients with uterine fibroids and patients in the body, including the effects on the endometrium.The clinical symptoms and signs, the changes of hormone levels and the results of B-ultrasound were followed up.ResultsAll of the 100 patients were treated with low dose mifepristone for a period of time, all of them had amenorrhea.Before treatment, the level of estradiol in patients was (298.5±156) pmol/L, and the level of progesterone (2.8±1.3) was pmol/L.After 6.5 months of treatment, the level of estradiolof the patients was(228.4±114)pmol/L, and the level of progesterone(1.3±0.5)pmol/L was pmol/L.The results showed that the levels of progesterone and estradiol in patients after treatment were significantly lower than those before treatment, with statistical difference (P<0.05).There was no significant change in endometrial thickness after long-term low-dose mifepristone treatment (P>0.05).After treatment, the total effective number of cases was 92 cases, the effective rate was 92%.ConclusionSmall dose of mifepristone for uterine fibroids clinical treatment effect is good, to a large extent, improve the effective rate of treatment and high safety, with the clinical significance of further promotion and application.