Abstract: A toothed chaincutter was invented with analysis of systematically theory and　field experiments. The designing index were introduced in the paper. Field experiments indicated that the toothed chaincutter was less power consumed, it can perform not only at a high cut speed and forword speed but also with advantages of wide coverage working smoothly, little vibration， little noise, and high productivity. The toothed chaincutter can be employed in various harvesters and fit into cutting wheat,rice and other stem crops and hay.