In order to evaluate the stability of chatter vibration in turning precess, the micro-positioning cutting test with artificial tool vibration by piezoelectric actuation were carried out. In experiment, the phase lags between cutting forces and chip thickness variations were measured, and the dimensionless penetration-rate coefficient（$overline{K^*}$） which is the most important parameter on the stability for chatter vibration was calculated. The results show that$overline{K^*}$ can be applicable to the stability criterion for regenerative chatter vibration.