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In this paper, the finite element software msc.marc is used to analyze composite tubes with different layer structures.Firstly, the bulking loads of different layer structure tubes are obtained by bulking analysis.Secondly, the model of transmission tower with composite cross arms is built and the loads are added to it.After calculation, the maximum axial force and bending moment in composite tube of left cross arm are obtained and are added to the model of composite tube separately.Finally, the maximum stress in different layers and some conclusions are given.