Abstract: OBJECTIVE To improve the new synthetic route of taurine. METHODS Taurine was prepared from monoethanolamine (MEA) by intramolecular dehydration in the presence of HZSM-5 molecular sieve and ring-opening addition with sodium hydrogen sulfite. RESULTS The optimum reaction conditions were as follows: the reaction temperature was 425℃, the reaction pressure was atmospheric pressure, space velocity was 2 300 h^-1, the ratio of volume of N2 to MEA was 10. By using the above conditions, the monoethanolamine conversion amounts to 93.2%, the selectivity is 84.6%, the total yield of taurine is 73% (ethanolamine). CONCLUSION This method is superior to that of esterification of monoethanolamine(>50%) and ethylene oxide(>60%)and it is suitable to the industrial production.