The bearing load（BL）governs the stability of axes set in the multi-support-rotor systems（MSRS）. The torque turbulence (TT) would change BL, which could cause instability of axes set. In order to discern the torque turbulence, the theoretical analysis about the TT effecting on the BL had been done, as well as the coupled model about TT and BL had been established, and the experimental study was presented in the paper. The two-directions bearing load sensor was introduced and its dynamic characteristic was analyzed as well according to its measuring principle and structure feature. Indirectly measuring the load of bearing bracket in radial and axle direction, the sliding bearing load could be acquired. An eight-support rotor test rig which is a MSRS with sensor was established, and its dynamics character was analyzed. The coupled model about TT and BL was set up. Finally, the experiment about BL in different support positions with two typical TT had been done. With the experimental results, it was manifested that the bearing load sensor has the characteristics of highly sensitivity, and the bearing load value could be monitored online when the TT exerted on the rotor system. The coupled model is verified, which provided the theoretical foundation and test data for the torque turbulence recognition.