Abstract:A new 2type tunneling system , Co llim ated A b rasive W ater J et (CAWJ ) cu t ter, is develped to increase the tunneling speed and imp rove the cu t t ing quality in hard rock. A nd it s characterist ics of conf igu rat ion and operat ing p rincip le are discu ssed. The effect s of cu t t ing hard rock w ith variou s operat ing param eters on the cu t t ing eff iciency of CAWJ are analyzed. Research resu lt s show that it is p rim arily feasib le fo r tunneling hard rock w ith CAWJ.