Based on the 0.Nigol mechanism,the dynamics model of galloping transmission lineswhich considering the transverse and torsion coupling is constructed.By using the mathematical meth-od with decoupling of inertia term and Matlab program,the dynamic system was simulated.The influ-ences of wind velocity,vertical damping,static tension,thickness of ice,density of lines and air den-sity on the amplitude of galloping were obtained.The variation of galloping amplitude under differentsystem parameters were analyzed,it showed that the parameters of the speed of wind was the mainreason for determining the transmission lines galloping,which provided valuable reference and in-struction for solving the similar practical engineering problems.It is shown that the bifurcation of peri-odic solutions appear with the increasing of wind speed.