The lithium metal electrode was pretreated to be soaked in 1,3-dioxolane,1,4-dioxane and tetrahydrofuran separately,then Li metal cell was assembled with LiCoO2cathode.It is found that the cycling and discharge performance are improved greatly when lithium electrode was pretreated with 1,3-dioxolane and 1,4-dioxane.But lithium electrode properties treated with tetrahydrofuran can’t be improved.Comparatively,the cell has better performance when treated with 1,4-dioxane,but its discharge property was depressed after 50 cycles.Further measurements show that the performance of lithium electrode can be improved greatly if it is pretreated in the following project: 1,4-dioxane(70%)+electrolyte(30%)+LiPF6(saturated concentration).The cycling life increases about 20%,and the discharge plateau at 80th cycle increases about 200 mV.