Abstract: Objective： To observe the clinical application of levonorgestrel-releasing intrauterine system （LNG-IUS），and to evaluate the effeciency of resetting the downward shifted LNG-IUS. Methods：Total 152 patients with LNG-IUS were follow-up visited，to assess the degree of dysmenorrheal，the extent of menstrual bleeding and the position of LNG-IUS in uterine. The reposition under the guidance of B ultrasound were performed in 45 cases with ectopic LNG-IUS. Results：Both VAS grade and PBAC grade after inserting the LNG-IUS were significantly lowered when compared with their pre-deposited grades （t＝2.15，P＜0.05；t＝142.63，P＜0.01）. Of the 45 cases undergoing reposition （29.6%），42 cases were still using the device. Conclusions：LNG-IUS is one of the effective treatments for dysfunctional uterine bleeding and adenomyosis of uterus. The reposition of the downward shifted LNG-IUS under the guidance of B ultrasound is safe and feasible.

Key words: Intrauterine devices, Intrauterine device expulsion, Intrauterine devices, medicated, Functional uterine bleeding, Endometriosis, Menorrhagia