Abstract: Ensuring the safety of transmission line channel is one of the key tasks of transmission operation specialty. Most hidden dangers can be found by manual inspection of transmission lines. However, due to the complex and changeable channel environment, especially the hidden dangers of trees, there are blind areas and visual misjudgments in manual inspection. In serious cases, trees touch conductors and cause gate dropping accidents. Therefore, the hidden dangers of the channel are combed and investigated in combination with laser scanning technology. Taking the 110 kV inter toothed line as an example, the transmission channel environment is analyzed. After the analysis, the hidden dangers of the channel are analyzed through the cross crossing details and the safety distance of real-time working conditions. Provide data support for line data sorting and"three spans"management of operation teams. It is very necessary to analyze the transmission line channel based on 3D laser scanning point cloud.