Although the self drilling anchor bar is a new type of anchoring support tool, it has advantage of strong adaptability, easy operation, and good anchorage effect, and is widely used in various projects. The construction technology of the self drilling anchor bar in detail below. When drilling, use a trolley or a hand-held rock drill to drill the rock bolt with the drill bit installed to the designed depth. The rock bolt is designed with a thread. If it needs to be lengthened, it can be connected with a connecting sleeve and then drilled through the drilling rig. During the drilling process, the borehole can be grouted through the hollow bolt. The grouting pressure is determined according to the parameters and the performance of the grouting machine. After the grouting is full, install a stop plug. Finally, according to design requirements, install the backing plate and nuts. Before grouting, the self drilling bolt can be used as a blowing pipe to remove the dust formed by the rock; at the same time, it is also a drill pipe and a grouting pipe.