The Diploma thesis deals with the influential assessment issue aimed on timber harvesting and delivery technologies in the forest stand and soil of limited company Lesy Jasov. The monitor were forestry tractor (LKT) 81 T and all - purpose tractor (UKT) Zetor 6340. The main purpose of the thesis was the damage detection of given conditions in stand after logging in two different altitudes. Values measured in stand damage was the tree damage size and degree on restricted surfaces and given spots on a tree. Measured magnitude were also the depth of wheel track caused by harvesting - delivery technologies on the lines, and by towing the timber and logs with hauling engines. The results revealed that LKT caused higher damage range of remaining forest stand and also of soil damage in the comparison to UKT.