Abstract: The gas pipeline from west to east in China exceeds 4000 km. There are 155 landslides along the pipeline. But only 17 landslides are unstable. Most of the unstable landslides are located in Ningxia, Shaanxi and Shanxi which are shallow loess landslide and deposit landslide. The formation mechanism of the unstable landslides include the landform and physiognomy, stratum lithology, river erosion and man-made factors. The danger to the pipeline and its attached facilities are researched. The countermeasures of prevention and treatment are proposed, such as anti-slide retaining wall, slope leveling and waterproofing.