A scientific drilling hole with a depth of 3000m was designed for the regional geological survey project （map of Qingxu County and Xugou） in surveying area of Qingxu County， Shanxi Province. Full-hole coring was required with the core recovery rate over 85%， the core diameter over 60mm， and the rock samples should be undisturbed. Aiming at the problems of deep and thick overburden stratum， large diameter， high fidelity and full hole coring， etc.， actions of drilling strata and possible bolehole accidents analysis， CHD127 rope drilling tools application， drilling structure optimization， constant pressure automatic drilling technology and enhancing mud liquid use management are taken， the technology of “water source drilling rig+rope coring+long open hole drilling” was innovatively explored， and the project was completed with high quality. The field practice and application show that the technology of “water source drilling rig+wire-line coring” used in continuous core drilling of deep-thick overburden strata is better than the vertical shaft core drilling machine. The coring tool combined with PVC tube can meet the requirements of rock sample fidelity and quantity preservation， high-quality mud can realize full open hole drilling. The process of “water source drilling rig+wire-line coring+coring tool lined with PVC tube” can be popularized in geotechnical engineering investigation， hydrogeological hole with the hardness of middle or lower and deep hole of coalbed methane exploration.