As one of important life line systems

the damage of transmission tower could cause great economic loss. According to the statistics

lost stability under dynamic wind load is one of the most usual destruct form in the construction of transmission tower. So

the research in this aspect is very meaningful. In this paper

we used the fluctuating wind field simulated by harmonic wave superimposing method

based on the nonlinear buckling analysis and the transient analysis package of the finite element program ANSYS

researched the dynamic stability of a transmission tower in Shenyang by two kinds of methods-Budiansky-Roth criteria and incremental dynamic analysis combining with displacement equivalency criteria. The results show that the dynamic characteristic of wind has a remarkable effect on the stability of the transmission tower

and the current criterion used in the design of transmission tower is unsafe.