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Simulation and Test of Torsional Vibration of Compressor for a Continuous Transonic Wind Tunnel are carried out to meet the requirement of research on the excitation mechanism and restraint method. The parameters of the compressor shafting are used to model and simulate,and the torsional modes and rotational speed of first to fourth order are obtained. The data of torque amplitude,torsional angle and rotate speed are gotten by using the test method of wireless strain torque test and gear disk-eddy current test. The test results show that the data getting by simulating,wireless strain torque test and gear disk-eddy current test have good consistency,and all the three approaches are feasible. The data of analysis and test can be an important reference for the subsequent experimental verification of the excitation mechanism and restraint method.