Contains information about the deformability of the wood of the main species under the action of forces across the fibers; the mechanism of formation of internal stresses during drying is illuminated; experimental and theoretical methods for analyzing the stressed state of wood during and after drying are described; production methods of stress control are considered; provides a quantitative characteristic of the stressed state of wood in various drying methods and modes, as well as in other types of hydrothermal treatment; recommendations are given to improve methods of stress elimination after drying; new methods of residual stress relief in wood are described.