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Hangers are very important components for suspension bridges,which link main cables and stiffening girders.When in service,hangers are much vulnerable to fatigue loads due to kinds of traffic flows,which may reduce the remaining life of the hangers and increase the risk of losing public confidence in cable supported bridges.In order to quantify the reliability of hangers under vehicle loads,fatigue reliability formula of hangers is proposed in this paper.Based on the accurate analysis of vehicle load spectrum,the time history of hangers is simulated.Jiangyin Bridge is used as a numerical example to validate this method.Jiangyin Bridge is a suspension bridge with a 1385m central span length,which is the second longest bridge in China.The work of this paper will contain: simulation of vehicles load history spectrum of suspension bridge,fatigue reliability of hangers of suspension bridge and reliability-based fatigue life assessment of hangers.