The thesis is based on a research of new composite sandwich plates that consist of skins and the cell type hollow core, which is made of cell type hollow ribs of plywood or other composite. Such plates provide reduced material consumption and increased specific load bearing capacity (load bearing capacity of unit mass) and other improved properties comparing to the traditionally used materials. Specific load bearing capacity of these plates in bending is up to 60 % increased comparing to plywood. The thesis consists of 5 chapters: The first chapter consists of literature review for the sandwich type plates subjected to bending, their classification, existing methodology of calculations and optimization as well as manufacturing technologies. The methodology for calculation of plate’s load bearing capacity in bending taking into account the characteristics of strength and deformability of core and skins including properties of glued joint between the core and the skins has been developed and the experimental investigations for validation of developed methodology have been done in second chapter. The methodology for determination of the specific load bearing capacity for these plates in bending and rational parameters for given load bearing capacity have been developed in third chapter, which is based on experimental design approach and optimization algorithm involving the methodology developed in second chapter. The fourth chapter consists of basic principles of manufacturing for plates’ with cell type hollow core. The manufacturing of cell type ribs from plywood sheets and the distancing laths have been described in first part of fourth chapter and the estimation of optimal bond pressure to reduce the dispersion of results have been determined in the second part of fourth chapter. The recommendations for rational structure design of plate’s geometrical parameters have been provided as a guidelines and the advantages (reduction of mass or total thickness of structure to fulfil the load bearing and insulation requirements) in comparison to plywood and CLT plates are shown in fifth chapter. The thesis includes 76 figures and 16 tables. The total volume of the thesis is 103 pages and 1 annex. The Bibliography contains 165 sources.