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_{: This paper introduces the working principle and experimental method of the zero torque test of the test bed of the turbo shaft engine. Details of the key equipment driving device, type design, control principle, control logic, HMI, security measures. The experimental results show that the selection of the device is reasonable, stable and reliable operation, high control precision, fast response monitoring and improvement, to meet the requirement of the engine zero torque test. The device realizes the zero torque test of the test bed of the turbine shaft engine, and fills the gap in the domestic black.}