An efficient and rapid procedure for ring opening of various epoxides with aromatic amines under water phase in the presence of Ionic liquid [Bmim]Im to synthesis β-amino alcohol, and the yield reached more than 84%. The effects of catalyst and its dose, ingredient ratio, reaction temperature and the recycling of [Bmim]Im were investigated. The optimum conditions were n(aromatic amines) : n(epoxides) = 1:1.2 and at 60℃. What’s more, [Bmim]Im reused five times , the yield could also reach more than 79%.