Ability of reproducing the fault of proving ground and user use is poor,which uses the traditional durability test method of the front swing arm bench.However,the road simulation test method is able to accurately reproduce the real road load spectrum of the swing arm,which has a good validation results.The article focuses on accelerated editing the target response signal of swing arm,a new method for compressing and reconstructing the time-domain load spectrum is put forward based on the intensified extrapolation and superposition of the load rainflow matrix according to the experimental conditions so as to further shorten the bench test period.The mean cycles of the load rainflow matrix were corrected,according to the Goodman method.And the S-N curve of the swing arm is calculated according to the nominal stress method.The damage degree of the measuring point load of the swing arm is compared before and after accelerated editing.The equivalence relation between the reconstructed spectrum of rainflow matrix and the original load spectrum was verified.Finally,the results showed that the speed-up ratio of the simulation iterative target response signal of the swing arm reaches 78.8 times compared with the road test at the proving ground,which is 2.4 times compared with the traditional bench test standard.A bench test was performed to verify that this accelerated editing method is effective.