With the implementation of the western development strategy in China, the construction of oil and gas pipelines in southwest China has made rapid progress, but there are more and more high-voltage transmission lines laid in parallel with these oil and gas pipelines, which have unavoidable interference and influence on each other.In order to ensure the safe operation of the pipeline and high-voltage transmission lines, the detection and analysis of the AC stray current interference suffered by two typical mountain pipelines in southwest China have been introduced in this paper,and the stray current drainage scheme and measures are formulated according to the special landform characteristics of the mountain pipeline andthe actual situation of the site.Finally, through the test and analysis of the stray current drainage measures after the actual implementation,it is concluded that when the ground pipeline in southwest mountain areas suffers the AC stray current interference, the form of stray current drainage well can be used to carry out the AC stray current interference.This scheme is suitable for the drainage of AC interference current in the southwest mountainous pipeline due to its small land occupation, and it is a way of simple site construction and remarkable drainage effect. The result provides reference for the disposal of AC interference in mountainous pipeline of similar conditions.