Abstract: The original landform of an engineering plant is mainly low hills, and nearly 20m thick layer of filled soil is formed in the process of construction. The composition of the filled soil is the loess with the mixture of sandstone and mudstone, which size is in variety and its bearing capacity cannot meet the requirements of the main building. The pile foundation is considered for main buildings. Because the filled soil underlying sandstone and shale interbed of bedrock, the percussion boring method is chose to overcome the difficulty of boring in filling and to meet the demand of rock-socketed after considering synthetically with various pore forming process and its adaptability. Therefore, the full scale test and research is conducted by adopting the vertical compressive load experiment, horizontal bearing capacity and pile body stress strain test method, and construction parameter is evaluated and the bearing performance of bored piles is analyzed. A large number of reliable experimental data is obtained, which is valuable for similar projects.