This paper introduces the investigation, planning and design of an earth dump site at valley. We first discuss the regulations, selection guidelines, alternatives, construction technologies, soil and water conservation, and cost/benefit estimation for an earth dump site. Eighteen valleys around the Linkou Terrace are then proposed as the candidate earth dump sites in the preliminary study. In particular, the largest dump site, Hung Shui Hsien Chi, was chosen to perform basic planning to the feasibility study level. This work clearly illustrated the main considerations in planning an earth dump site at a valley. Finally, the applications of Geographic Information System and Virtual Reality Modeling Language to the selection of an earth dump site are also introduced.