The selected problems of influance the wood harvesting methods on the forest environment. In the paper it was shown the necessity of extend the investigations of the exchanges the forest enviroment conditions during wood harvesting. At first it ought be connected with soil conditions (chemical, phisical and biological exchanges) and impure the air and soil by not natural chemical substances (oil, petrol, gas). The investigations must be continuated by many years permanently, must be complex and must be merits coordinated.