The percussive drilling of large diameter rock socketed inclined piles is very complicated. During the drilling process， common percussion bits have some shortages such as low hole forming efficiency， fast wear， short service life， and poor hole forming quality etc.， while the type of impact teeth on bits’ bottom， as well as its arrangement are key factors to solve the aforementioned problems. Based on this， the impact process of three kinds of impact teeth， i.e. triangular prism teeth， wedge teeth and double conical teeth were analyzed under different impact strokes and varied tensile strengths of sandstone. Results show that wedge-shaped teeth can be selected preferentially to drill soft formation， while triangular prism teeth should be selected if short impact strokes have to be used to drill relatively harder formations. The results in this study is meaningful to the teeth selection of impact bits in large diameter rock-socketed inclined piles construction by percussion drilling.