In view of the complex structure of the multi-channel high-pressure rotary joint of ZJU400 geo-centrifuge,the internal state is difficult to observe,and the fault is hidden,mechanical-liquid coupling and staggered,a monitoring method based on multi-sensor information sensing was proposed.The swing,vibration,temperature rise and leakage of the rotary joint were selected as the state monitoring parameters.The data were collected,analyzed and recorded by the control system of the upper and lower computer,and the real-time monitoring of the operating state of the whole system was realized.By extracting and analyzing the comprehensive characteristics of the radial swing of the rotary joint,the bearing vibration signal,the core shaft temperature rise and the fluid leakage,it is indicated that the whole system is in good operation condition.