It is hard to measure the load history of the working device of hydraulic excavator in fatigue analysis.To solve this problem a novel fatigue analysis method is proposed.First,the complete change process of digging resistance,named Digging Resistance Load Spectrum(DRLS),is obtained by simulating the digging process of soil with the bucket of hydraulic excavator.Second,according to the DRLS,the load history of each hinge of the working device is calculated by the operation simulation of a full typical workin...