In order to study the local resonance of a flexible-rod whetstone-seat vibration subsystem in the ultrasonic honing device,and to regard the flexible-rod and whetstone-seat as the independent part under dynamics significance,the flexible-rod whetstone-seat vibration subsystem of ultrasonic honing device can be simplified as the series system composed of a flexible-rod and a whetstone-seat. On the other hand,the formulas of natural frequencies and vibration displacement of the vibration subsystem have been e...