Abstract: Fault is an important geological factor for mine earthquake.This paper,based on former research,firstly analyzes the mechanism of mine earthquake in fault area with stick-slip instability theory.Then the signal characters of vibration are analyzed in fault area of a certain mine by virtue of the SOS micro-seismic monitoring system,the velocity and acceleration signal characters of seismic wave are analyzed.The result shows that mine earthquake mechanism in fault area conforms to the stick-slip instability theory.