Kinetic studies on complexation reactions of Li-I with cryptand C211 in NN-diethyl-N-methyl-N-(2-methoxyethyl)-ammonium bis(trifluoromethylsulfonyl)imide (DEMETFSI) and 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)-imide (EMITFSI) have been carried out using Li-7 NMR. It was found that the reaction rates in both solutions depend on concentrations of free Lit and that their kinetic parameters are almost same. From these results, it is proposed that the Li-I complexation reactions in DEMETFSI and EMITFSI solutions proceed though bimolecular mechanism.