The primary factor of influencing the process of biomass hydraulic briquetting was analyzed and studied. The experimental result indicated that the best range of containing water ratio was 0.15～0.18. Based on the results, the simulation of the process of biomass hydraulic briquetting was carried out with the finite software ANSYS at first. Then the displacement and strain in the biomass extrusion process was analyzed, and the rule along with the disciplinarian of frictionchanging in the process was obtained. All these provided credible conditions for the study of biomass briquetting mechanism. 