Drilling is a direct and important method of gaining the underground information in the water resources and hydropower engineering exploration, and the quality of drilling is very important for the water resources engineering's investment and safety. The wire-line coring drilling is a key technology in improving drilling quality, which is widely used in land resources, metallurgy and coal. But there are some problems in water pressure test, unsuitable specification of wire-line coring drilling tools and the flushing fluid limitation. By the analysis and study on the above problems, the solution was put forward and good effects were received. By the designed method of water pressure test with no-hoisting drill, the combination of water pressure test and wire-line coring drilling solved the technical difficulties in wire-line coring drilling to adapt water conservancy and hydropower exploration.