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The transmission lines trip accident caused by bird streamer has become increasingly prominent. It is more common and widespread than generally believed, and greatly threatens the reliability of transmission lines. In this paper, a kind of liquid to simulate bird streamer is been made according to the electric conductive and viscosity of bird excrement (bird streamer). The experiment platform is set up in the laboratory to study the AC discharge characteristics of tower-line air gaps under the influence of bird streamer. At the same time, discharge model caused by bird streamer is been established with the use of COMSOL Multiphysics to investigate its breakdown mechanism. The results show that, air gap breakdown voltage decrease by about 80% under the influence of bird streamer. And in view of this kind of accident, some methods to prevent from these faults are provided in this paper.