The pulse type feed of working table using logic control system of NC milling machine was studied to implement NC vibration milling and cutting of separation type pulse cutting force. The vibration milling processes on the pulse vibration direction along with feed and on the pulse vibration direction by some angle with feed were studied, and comparative test of cutting force in the process was made. The test results show that the cutting force and the cutting temperature are reduced in vibration milling on vibration direction and the feed direction at a certain angle, and the process is strengthened. Surface roughness is little affected. Cutting effect varies widely with different feed line and the logical relationship.