Abstract: Objective： To evaluate the adverse events of the copper-T Intrauterine device（IUD）breakage, so as to explore the relative factors. Methods: A total of 30 cases of the breakage adverse events related to copper-T IUD were collected from 105 contraceptive adverse reaction surveillance sentinels from October 2005 to November 2010. All of these cases were analyzed by the method of causality assessment. Results: There were 4 TCu380A cases and 26 TCu220C cases in 30 cases. The fracture parts were cross arms in 28 cases and trailing arms in others. The breakage constituent ratio of TCu220C from B enterprise was higher than that from A enterprise（IC=0.40， lower limit of 95%CI=0.02）. Conclusions: The postmarked surveillance of TCu220C from B enterprise should be strengthened. The professional staff of family planning should pay attention to the adverse events of copper-T IUD breakage. To prevent the serious injury events，it is key to keep up the follow-up visit system after insertion. The adverse events should be treated timely, and the serious injury event should be reported immediately.

Key words: Intrauterine devices, copper, Breakage, Adverse event, Serious injury event