Chainsaw is the most used device in forest industry. Tool of chainsaw is chainsow chain. It makes circulating motion around chainsaw bar. Woodcutting makes teeth of chainsaw chain. Teeth are round, half round and square. Purpose of this labor is analyse of cutting force, that arise at cutting of breech and spruce wood witch chain with pitch .325´´ and 3/8´´, recense energetic difficultness at cutting of spruce and breech wood, compare analytic values with experiment values of cutting force and making simulation of stress on chainsaw chain teeth. Conclusion of this labor is that smallest energetic difficultness at woodcutting was with chain with square teeth.