Abstract: Test pile experiment for a certain project in Shanxi suggests qualities of piles do not meet standard requirement, as the inverse drilling technique is not suitable under this circumstance. Nonetheless, when rotating drilling is preferred due to thick layer of mud cakes and sediments involved in this project, standard requirement can be satisfied. This research indicates that selection of appropriate drilling technique is strictly based on work field conditions. By doing so the drilling capacity can be further increased due to the enlarged side and tip frictions. Bearing capacity of single pile can therefore be achieved.