Based on a wharf project in the fluctuating backwater area of Three Gorges Reservoir in Chongqing,we calculate each mooring line and anchor chain’s average daily stress-duration curve within the scope of the whole fatigue life period under the four kinds of random process.Based on the Miner linear cumulative damage law,and combining with the T-N curve of each mooring rope and anchor chain,we get the cumulative fatigue damage of every one,and predict the fatigue life.The fatigue analysis method can not only provide a technical support for the safety hidden dangers’ rectification of pontoon mooring facilities in the fluctuating backwater area of Three Gorges Reservoir,but also provide valuable reference for the fatigue design and evaluation of similar projects.