Guizhou province is rich in shallow geothermal resource with huge exploitation potential. However， widespread carbonate strata and well-developed karst fractures in shallow formation cause great difficulties in placement of shallow underground heat pipes. In the case of placement of the underground heat pipes for the shallow low ground temperature central air conditioner of Maternity and Childcare Hospital of Huairen， Guizhou， various technical measures， including eccentric DTH （down-the-hole） hammer drilling with simultaneous casing， DTH hammer drilling， dust removal by the simple dust remover， sealing off karst caves with cement and logs， RIH of pipes with the auxiliary winch， have been adopted to solve the technical problems such as difficulty in borehole completion， environmental pollution by dust from DTH hammer drilling without underground water over full holes， laying the heat pipes （PE pipe） through karst caves due to presence of loose shallow backfilling and karst weak formation encountered in placement of underground heat pipes in the dewatered karst area characterized by local karst development and water shortage（produced by dissolution， rupture structure， and deep cutting by the river） over the length of the underground heat pipes. This not only guarantees project quality and safety， but also improves construction efficiency， providing construction experience for similar projects.