Rubber wood (Hevea brasiliensis) was employed as a biomass raw material for the hydrothermal pretreatment process for the enzymatic hydrolysis. Pulverized rubber wood was treated at 130-280 degrees C using an autoclave inner Volume of: 96 cm(3). The glucose content of the treated liquid product was measured. The solid product was analyzed for cellulose content and further treated with cellulase. The product glucose yield indicated the effectiveness of the hydrothermal pretreatment. A reaction network model for the hydrothermal pretreatment was proposed and applied successfully. The reaction parameters were determined.