Abstract：Zhejiang Tongxiang is the country's first global promotion 20kV voltage level area. Compared with 10kV, 20kV line operation and maintenance difficulty increased, especially in the aspect of anti bird. The according to the practical work, based on the historical condition of Tongxiang 20kV circuit bare wires that run. Firstly review the 20kV circuit of bird origin, followed by an analysis of Tongxiang region bird. Finally, from organization, technology and other aspects on how to improve the 20kV bare wire of anti bird level elaborate. The author's research results have experienced the operation of Tongxiang power network, the results show that the method is effective and has the promotion value.