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In this paper, the fatigue test method is studied based on 4-channel road simulation rig, which examine fatigue performance of truck cab with vehicle frame and suspension system.The motion of the cab is analyzed.The inner force of exciter and fixture is reduced through frame designand fixture design, and ADMASis used to validate the method.Then the acceleration signal is regarded as the target signal, the load spectrum is reproduced in the test rig through physical iteration.Finally, the weakness of the cab obtained is similar to results of proving ground test.