The pre-stressed anchor cable technology is the common technology used in geological disaster control construction, such as landslide control, slope anchorage and so on. For traditional anchor cable, anchor head was freely placed in the inner anchoring section inside the hole and the grouting was carried out in absence of pre-stressed state of inner anchoring section. But for self bearing type pre-stressed anchor cable, grouting is conducted in the pre-stressed condition. It is advantageous to the full play of mechanical properties of the slurry material and rock. In the fractured rocks of medium hard, after the anchorage section is reamed and the self-bearing type pre-stressed anchor installed, the bearing body is expanded, and the anchor is firmly locked under the action of the friction force and the end bearing capacity of the hole. It is therefore necessary to develop a reaming drill tool and drilling technology which are suitable for DTH hammer drilling in medium hard rock stratum(compressive strength is less than 30MPa). The results of the indoor experiments of ream drilling show that the developed reaming drill tool and drilling technology can be used for reaming in anchor section.