A digital construction management system which integrates computer technology, GIS technology, database technology, and wireless sensor network technology is introduced, and its application to the Dagangshan Hydropower Station is described. Functions inclusive of 3-D visual simulation, construction grouting, concrete temperature control and safe blasting monitoring are elaborated in detail. With this system, a data collection mode which fits the dam construction characteristics is established. Moreover, 3-D visual query, query and analysis of concrete temperature control, as well as process control and quality management for foundation treatment works are also accomplished. Digital system could realize the management and sharing of centralized data, enhance the standardization, refinement and personalization of the construction site, and provide technical support for the decision-making of hydropower construction.