The bachelor's thesis deals with the research of the dependence of thermal conductivity on equilibrium moisture content in wood. The aim of this work is to demonstrate the applicability of extended dynamic plane source method for determining the thermophysical properties of wood and to verify whether the dependence of thermal conductivity on density can be described as a linear function of density. Based on experimental results and statistical parameters of the linear fit between density and moisture content i. e. thermal conductivity and density. The coefficient of variation in the determination of thermal conductivity does not exceed 14% with an average value below 10%, which is excellent repeatability. Correlation coefficient between thermal conductivity and density i. e. The density and moisture content is not less than 0.938 with a relative mean square error below 1.7%, so we can say that both theoretical models are valid. The importance of our work is the expansion of knowledge in the field of thermophysics of wood and changes in its thermophysical properties, more precisely thermal conductivity, by influence of moisture content in individual anatomical directions. At the same time, confirmation of the possibility of using the extended dynamic plane source method to determine the thermophysical properties of wood.