Abstract: Studies on Li cell have made great progress these years,which brings study and use of organic electrolyte solutions.In the development and use of the cell,people show great interest in the purification of the solvents which make the electrolytic solutions,and its effect.Because of the chemical specific property of Li,people pay close attention to removing water from the solvents.The propylene carbonate(PC),1,2-dimethoxyethene(DME),tetradrofuran(THF)and 4-butyrolactone(BL)are usually used as solvent to prepare electrolyte solution for Li cell.This paper is about the study on purification of organic solvent and its effect.Experiments show that the means of purification in the paper may produce good effect of removing water.