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Remote sensing satellite to achieve wide FOV and high resolution, generally equipped with large inertia load with imaging components that can reciprocating rotation. however, the impact on satellite attitude control of the interference generated by the rotation, often failure to meet the attitude stability and pointing precision index requirements necessary for load imaging, so the satellite platform needs to take measures to suppress the disturbance torque. Nevertheless, due to the reasons of machining and assembly, disturbance torque of the load often different from the design value, which brings uncertainty to compensation scheme design, parameter binding and the confidence level of verification in laboratory confidence. This paper introduces method to calibrate the disturbance torque of the moving parts of a spacecraft by using a single axis air floatation platform. Design test to illustrate the realization of the technology under antivacuum condition in laboratory, Explain the difference of the test on the ground and in space, And The error which affects the calibration result is analyzed.