 The study investigates the properties of cellulose extracted from Mendoong fiber using two methods, alkali and alkali assisted by PEF, and compares it with commercial cellulose through x-ray diffraction, failure transform infrared, thermogravimetric analysis, and morphological analysis using optical and scanning electron microscope. The results show that the crystalline structure properties of cellulose extracted from Mendoong fiber assisted by PEF are similar to commercial cellulose. This article was authored by Haru Sorianto, Ahmed Atif Fikri, Avita Ayu Permanasari and others.