Wumeng mountain groundwater exploration and production is a national key poverty alleviation project, combining hydro-geological investigation with water supply well construction, this project provided drinking water for more than 50 thousand people by more than 50 constructed exploration wells. Pneumatic DTH hammer has played important role in this project; this paper describes its technical advantages, introduces this drilling technology about the construction process, equipment selection and the typical complex conditions treatment, and puts forward the research direction of this technology in hydrology and water well construction in nest step.