The two-stage process for producing biodiesel from crude oil consists of two methods: saponification followed by trans esterification, and esterification followed by trans esterification. Nevertheless, the latter two-stage process (esterification followed by trans esterification) is offered in this investigation to produce biodiesel from oil containing high FFA in un-degummed state, because it requires shorter time and lower production loss than that from the process of saponification followed by trans esterification, In this produce. Acid catalyst esterification (the first stage) was employed to reduce FFA by converting it into biodiesel, Then, alkali catalyst trans esterification was subsequently used to convert glycerides (triglyceride (TG), diglyceride(DG) and monoglyceride (MG)) into biodiesel.