Huge power transmission system is one of the most important infrastructures in China and to assure its safety and reliability under the action of long term wind load is the key to be concerned. In this paper

a refined finite element model of transmission tower-line system is set up by Abaqus and the wind loads are simulated. Considering the instability of the stressed bar

the response of tower line is analyzed by the dynamic calculation method and

on this basis

its weak position is determined. Furthermore

the stress time history of weak bar is taken as a index

the life of tower line at different wind velocity is predicted by using the rain flow method on the basis of the damage law described by the Miner linear criterion. Then

the influence of the key parameters of wind load simulation on the structure prediction life is studied and the liner is comprehensively assessed. The results show that taking the structure failure as the failure criterion of the whole tower line system can provide a definite reference for life prediction of system. The prediction life of structure is mainly controlled by the weak structure main element (main material of slope place). In addition

the parameters of wind load simulation has large influence on the prediction life. The difference between different simulation time is large. Kaimal spectrum model is more conservative than that of random Fourier spectrum. And rough length is negatively correlated with prediction life.