Abstract: Method for manufacturing flame-resistance-treated decorative plywood by treating and permeating veneers with a flame retardant liquor. The flame retardant is able to penetrate into the interior of the veneer block, providing esterifications, aetherifications, and/or graft-copolymerifications to the hydroxy groups etc. within the veneers so that air, fire headstream, and inflammable gas are insulated or diluted to provide each veneer layer with flame-resistant capability. The heat decomposition process of the veneer is changed and inflammable capability controlled. The physical and chemical characteristics of the veneer is minimally altered after the treatment.