[Objective] The paper aimed to study effects of continuous light on rhythm of Apodemus agrarius. [Method] The changes in rhythm of A. agrarius activities were observed under natural light and 24 h continuous light condition. [Result]A. agrarius activated at daytime and night,but the activity time at night was longer than that at daytime,and the peak period of activity also occurred at night. When exposed to natural light,the activity time,feeding time and drinking time of A. agrarius were( 27 870 ± 5 252) s,( 6 171 ± 1 529) s and( 474 ± 92) s,respectively; when exposed to 24 continuous light,the activity time,feeding time and drinking time of A. agrarius were( 19 935 ± 2 971) s,( 5 870 ± 1 988) s and( 331 ± 117) s,respectively. [Conclusion]The activity time of A. agrarius changed significantly under two different light conditions,while feeding time and drinking time had little changes. [Objective] The paper aimed to study effects of continuous light on rhythm of Apodemus agrarius. [Method] The changes in rhythm of A. agrarius activities were observed under natural light and 24 h continuous light condition. [Result] A. agrarius activated at daytime and night, but the activity time at night was longer than that at daytime, and the peak period of activity also occurred at night. When exposed to natural light, the activity time, feeding time and drinking time of A. agrarius were (27 870 ± 5 252) s, (6 171 ± 1 529) s and (474 ​​± ​​92) s, respectively; when exposed to 24 continuous light, the activity time, feeding time and drinking time of A. agrarius were (19 935 ± 2 971) s, (5870 ± 1 988) s and (331 ± 117) s, respectively. [Conclusion] The activity time of A. agrarius changed significantly under two different light conditions, while feeding time and drinking time had little changes .