This study is related to the synthesis of cyclic carbonate from carbon dioxide and butyl glycidyl ether (BGE) without using any solvent in the pressure of ionic liquid as catalyst. The catalytic activity was studied in a batch reactor with different 1-alkyl-3-methylimidazolium salts at 60-120 ℃. The conversion of cyclic carbonate was affected by the structure of the ionic liquid ; the one with the cation of bulkier alkyl chain length and with more nucleophilic anion showed better reactivity. The conversion of BGE also increased as CO2 pressure, reaction temperature, and reaction time increased.