2⁃Phenylthioethanol was synthesized from thiophenol and ethylene carbonate using 1,5⁃diazabicyclo[4.3.0]non⁃5⁃ene (DBN) as a catalyst. The effects of catalyst type and amount, reaction time and temperature on the reaction were studied. The results showed that, the conversion of 2⁃phenylthioethanol can reach more than 90% when the reaction temperature is 50 ℃ and 100% conversion can be obtained when the reaction temperature is 90 ℃ using DBN as the catalyst, n(thiophenol)/n(DBN)=100, the reaction time 10 min. The selectivity of the catalyst of the synthetic route is 100% The paper discusses the reaction mechanism according to the theory of soft and hard acid and alkali.