Abstract: From gravel filling type drilling structure of underreaming type drilling structure is discussed, and the test and application of construction technology by bare hole drilling, casing installation, reverse grouting cement, hole drilling, reaming and built-in filter installed a few part of the process, have the obvious superiority, in the operation of the meet the requirements of in-situ leaching mining on water, wash well with simple, good construction quality, construction of the high cost is low and the recovery rate of resources.