Abstract：Two double SO3H-functionlized Br鴑sted acidic ionic liquids (BAILs-1-2) were synthesized by using commericial available aliphatic polyamine tetramethylethylene diamaine, pentamethyldiethylenetriamine and 1,4-propanesultone as the sources chemicals via quaternarization and acidification two step reaction, their structure were confirmed by FT-IR and 1H NMP, their Hammett acidic functions were determinated using 4-nitroanilins as indicator by UV spectrum, two kind ionic liquids all showed stronger acidity than H2SO4 BAILs1-2 acted as catalyst and medium together with [bmim]Br for synthesis of sorbitol transparent nucleating agent was studied, the results indicate that the reaction could carried out smoothly under homogeneous conditions. Upon the optimized conditions，the amount ofBAILs1or 2 was 15mol%(based on aldehyde), the mass ratio of sorbitol/[bmim]Br was 4:1, the reaction could completed at 60℃ within two hour in isolated yields of 67～75%with high purity(melting range ≤5℃) .Ionic liquids could be recovered after removal of water in vacuum and washed with diether and reused three times without significant loss in their catalytic activity.