Previously, prior to acquire the suitable method for producing biodiesel from high free fatty MCPO, trans esterification was the first method offered to observe the characteristic of reaction. The results indicated that low or without yield of methyl ester (ME) was obtained. The reason is that while biodiesel is produced from MCPO with trans esterification, FFA in MCPO is reacting with metallic alkoxide to produce soap (saponification). Therefore, it is necessary to reduce FFA in oil before starting the process for producing biodiesel. There are four feasibility methods that can solve this problem: enzymatic-catalyzed trans esterification, acid-catalyzed trans esterification, supercritical carbon dioxide technique and two-stage process. However requires lower reaction time, lower temperature and lower pressure more than other processes.