Abstract: Seismic ffragility assessment of existing communication towers is an important component in the seismic risk assessment of communication systems. Due to the influence of environmental, human and other factors, there are some structural defects in the service period of existing communication towers, such as verticality overrun and failure of partial members, etc. These structural defects may affect the seismic performance of communication towers. In this paper, a 51.05m high existing communication angle steel tower is taken as the research object, and a numerical model is established based on the OpenSees, and the verticality overrun and failure of partial members are simulated by the moving coordinate method and the dismantling member method respectively, and the numerical model of the communication tower considering the structural defects is developed; Then, 20 real Seismic records are selected, and the seismic fragility analysis of existing communication towers is performed based on the strip method, which takes the verticality overrun and part of the partial members fail into consideration. The results show that: Verticality overrun and failure of partial members can lead to a significant reduction in the seismic performance of communication towers, and therefore the effects of structural defects need to be considered in the seismic performance assessment of existing communication towers and the seismic risk assessment of communication systems.