Abstract: The carbon-based solid acid was prepared from bamboo powders by carbonization and sulfonated with 98% sulphuric acid.It was analysed by Elemental Analyzer,SEM,XRD,TG-DSC and TPD.Jatropha curcas var. mutiflorm was a new source of Jatropha curcas with high yield and high oil content,and used as raw material in this work.For the first time, the acid value of the Jatropha oil was reduced greatly in the esterification with the solid acid.The single factor experiments were used to optimize the variables.The results showed that the catalyst significantly improved the efficiency of esterification of Jatropha oil.The acid value of the Jatropha oil was reduced from 17.13 to 1.71 mg/g, and the esterification rate was 90.02% under conditions of 100 ℃,60 min, methanol/oil molar ratio 12/1 and 7% catalyst. The catalyst can be cycled 6 times with esterification rate still higher than 92%,which proved it was high-active and stable,and had potential industrial applications.