A selfdesigned ultrasonic vibration cutting system was used to experiment with varying cutting speed on aviation aluminium alloy (7075).The vibration cutting and nonvibration cutting (conventional cutting) experiments were performed for comparison. Experimental results show that the quality of the machined surface by using vibration cutting is obviously superior to the conventional cutting, vibration cutting exists an optimum feed speed,the cutting force of vibration cutting is lower than conventional cutting, vibration cutting is more stable in the machining process.