【Abstract】 Objective To study the effect of holding periods of bromadiolone powder and pure liquid on its control efficacy. Methods The production dates of bromadiolone powder were 1995 and 1999, and that of bromadiolone pure liquid were 1995 and 2000, respectively. Each of them was diluted into 0.005% bromadiolone baits. Six rats and mice were selected randomly to do no-choice experiment in the lab. Results The mortality of the tested rats and mice was 100%. The longest survival times of rats and mice were 7 days and 13 days, respectively. There was no significant difference between them（rats：χ2＝0.43, P＝0.934；mice: χ2＝7.07, P＝0.070）. Bromadiolone powder and pure liquid was still effective after storage for 5-10 years. Conclusion The control efficacy of bromadiolone powder and liquid did not change within 10 years at the optimum storage condition.