In this experiment, the plum seedlings of Wanhong, Wanhuang, Changli No.15, Jihong and Jishengwere used as test materials. The sensibility of shoot growth rate resistant to water deficit and lethal time after stop-ping water supply at different development stages were studied by artificial simulated water deficit treatments. Theresults showed that there are linear corelation between shoot growth rates and water quantities. Three plum cultivars,Wanhong, Changli No.15, and Jisheng were sensitive to water deficit, but Wanhuang and Jihong were not sensitiveto water deficit. The lethal times of Wanhong, Changli No.15, and Jisheng were longer than those of Wanhuang andJihong after stopping water supply at different development stages, which indicated the extreme drought resistancesof Wanhong, Changli No.15, and Jisheng were better than those of Wanhuang and Jihong.