The diploma thesis deals with the impact of technical and technological factors (cutting speed, sliding velocity, angular geometry of the tool, sample material and cutter blades), on the energy intensity of the planar milling of the thermally modified spruce (160 ° C, 180 ° C, 200 ° C and 220 ° C). The first part of the thesis is focused on the theoretical analysis of milling, the thermally treated wood, energy intensity and studied spruce wood. Work methodology is elaborated in the second part of the work, namely the preparation of the measurement samples, a description of the devices and cutting conditions of the measurement. The third part of the thesis is focused on the processing and evaluation of the measurement data and the description of the influence of individual factors. The main aim of the thesis is to evaluate the influence of the individual factors on the energy intensity of flat milling of the spruce wood. The last part is focused on the contribution of the diploma thesis into research and practice