Palm oil empty fruit bunch (EFB) is a waste from palm oil industry and commonly used as compost for soil breeding. EFB could be hydrolized into glucose using hydrothermal process with hydrochloric acid as catalyst. Eight gram of EFB in particle sizes (–30+40) mesh were hydrolyzed with HCl 10% 80 mL in a tube reactor. Reaction time were 2, 3 and 4 hours in temperature range 140-240oC. EFB decomposition did not increase despite of higher temperature while reaction time influenced the process significantly. EFB conversion was 47% in 4 hours and 240oC while in 3 hours resulted 34% same with 2 hours in 210oC. EFB decomposition did not influence glucose yield which was 23% in 2 hours 170oC, 24% in 3 hours 160oC and 6% in 4 hours 150oC. The optimum conditions of conversion were 2 and 3 hours with temperature range 150-170oC.