Abstract: This paper studies the measurements of the jitter created by the reaction wheel and the control moment gyro (CMG) in a remote sensing satellite platform. The back noise level is recorded and the modal test is carried out under the boundary conditions of air-bearing and suspension, and the influence of the boundary conditions on the test results is analyzed. From the measurements of the jitter caused by the reaction wheel and the CMG, the disturbance and transmission characteristics are analyzed. It is shown that the back noise of the cable suspension devices and the air-bearing system is smaller than the jitter measurement values, the disturbance will attenuate quickly and the jitter response of the reaction wheel and the CMG is not sensitive to the boundary conditions.