The paper presents a numerical study of the technological process and plywood structure (veneer arrangement and thickness) influence on shape of sheet. Technological process after the gluing process, including the conditioning of the sheet in various moisture-temperature conditions is numerically modeled. Technological treatment- conditioning produces the stress-deformation field in the sheet. The behavior of wood material produce the stress-deformation field change in time. The standard linear solid model constitutive model of material is used in analysis. The coupled moisture- temperature- stress analysis is done by using Finite element method. The moisture- temperature conditions on the boundary of the sheet is defined by polynomial equations. The rational moisture-temperature conditioning parameters and plywood structure are proposed that provide the necessary shape of the sheet and its stability in time