A fault fusion monitoring method based on evidence theory is designed for the vibration divergence fault in vibration systems. Multisensors are used to mesure the vibration signals. The variance of the multisource datas, quotient of forward difference of the variances and forward quotient of the variances are chosen as the state characteristic parameters respectively, then basic proba bility assignment functions are calculated. They are fused according to the dem pster combination rule. The fusion diagnosing and monitoring process is realized on the hardware experiment platform of the vibration isolator. Monitoring effects using each state characteristic parameter are validated, compared and analy eed. The results show that forward quotient of variance is suitable for the s tate characteristic parameter. The fusion method based on this can diagnosis t he vibration divergence fault effectively and achieve real-time monitoring.