By researching and analysing the operation of the transmission line, the author finds that bird damage is a major factor in the failure of the transmission line tripping. In this paper, after analysing related statistical data, the author elaborate the causes of bird damage through line characteristics, geographical environment and birds living habits. Then, the author analyzes the characteristics of bird damage failure. On the basis of fully learning from the advanced experience of the

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... , the author gives the countermeasures of the bird damage from a different fault type combined with the actual situation in certain provinces and the principle of bird damage prevention. Further corrective measures with the prevention of bird hazard are proposed according to degrees of failure of transmission lines in the province.