Coriolis mass flowmeter is built on the basis of vibration, so that better flow-tube vibration control is the premise of accurate measurement data. The limited gain and slow dynamic response of the traditional methods lead to unstable vibration or even stopped. In order to improve the amplitude control, a fuzzy-Proportional Integral(PI) control method is presented, and according to two-phase flow experimental data from Oxford University, the damping change pattern is simulated to reflect the process of two-phase flow. The driving system simulation model is established in Simulink and is compared with the traditional PI control methods, which demonstrates that the proposed method can obtain faster response speed, and more stable vibration amplitude.