The geothermal exploration hole (combined hole of exploration and mining) is an exploratory construction on the basis of the mining construction technology. This paper mainly introduces the construction problems encountered in the drilling construction and the application of new technology and new process, such as large diameter single pipe coring, well washing by air compressor combined with piston, lowing casings by every other grade, drill pipe tightness test for every 50m since drilling depth of 800m, drill bit sharpening by putting stones into the borehole and drilling in large water inflow formation.