Utilization of Bagasse Cellulose for Ethanol Production through Simultaneous Saccharification andFermentation by Xylanase. Bagasse is a solid residue from sugar cane process, which is not many use it for someproduct which have more added value. Bagasse, which is a lignosellulosic material, be able to be use for alternativeenergy resources like bioethanol or biogas. With renewable energy resources a crisis of energy in Republic of Indonesiacould be solved, especially in oil and gas. This research has done the conversion of bagasse to bioethanol with xylanaseenzyme. The result show that bagasse contains of 52,7% cellulose, 20% hemicelluloses, and 24,2% lignin. Xylanaseenzyme and Saccharomyces cerevisiae was used to hydrolyse and fermentation in SSF process. Variation in thisresearch use pH (4, 4,5, and 5), for increasing ethanol quantity, SSF process was done by added chloride acid (HCl)with concentration 0.5% and 1% (v/v) and also pre-treatment with white rot fungi such as Lentinus edodes (L.edodes)as long 4 weeks. The SSF process was done with 24, 48, 72, and 96 hour's incubation time for fermentation. Variationof pH 4, 4,5, and 5 can produce ethanol with concentrations 2,357 g/L, 2,451 g/L, 2,709 g/L. The added chloride acid(HCl) with concentration 0.5% and 1% (v/v) and L. edodes can increase ethanol yield, The highest ethanolconcentration with added chloride acid (HCl) concentration 0.5% and 1% consecutively is 2,967 g/L, 3,249 g/L. Thehighest ethanol concentration with pre-treatment by L. edodes is 3,202 g/L.