Abstract: Artificial shaft sinking has problems such as high construction risk，slow construction progress and poor construction effect.In order to adapt to the concept of mine safety development and improve the safety and efficiency of the mine building construction patio，the mechanical construction cut patio replaces the artificial shaft sinking.Based on the existing construction technology of Qijiaojing Iron Mine，the existing problems in rock drilling and well formation of the mine is analyzed.It is proposed to use KQG DHT drilling for rock drilling construction，and design the parameters of KQG DHT drilling for rock drilling and blasting. By organizing KQG DHT drilling to carry out rock drilling and blasting with large hole down to medium and deep hole，good well formation and groove blasting effect has been achieved.It is a general trend to use mechanical construction to cut the patio instead of manual drilling on this surface. It also proves that by optimizing the construction technology，the formation of reserve mining can be accelerated，and conditions can be created for mine safety and continuous recovery of ore. It can be applied and popularized in the same type mine.

Key words: KQG DTH drilling, medium and deep hole, drilling and blasting, cut patio