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In order to obtain the flight-test data of the rotor,the safety service life of the helicopter rotor is given,and the flight-test of the helicopter is prepared to test whether it can meet the design targets or not. it is necessary to design the data acquisition system of flight-test. Aiming at the problems of power supply and data transmission between rotating and stationary components, it is proposed that the way of inductive power supply and telemetry transmission technology in the short range,and introduced that the design scheme of the testing system. Through the ground test and the flight test,it is proved that the test system is reliable and effective.