Based on the problem of underground measurement technology, the characteristics and advantage of 3 d laser scanner and its application were introduced, including goaf potential safety hazard checking and controlling, mining area production and digital mine model construction. The research showed that 3 d laser scanner is with advantages of accuracy, safety, convenient operation and high efficiency, comparing with these traditional equipment, with promotion and use value. Meanwhile, 3 d geology model of the mine could be constructed by 3 d scanning system, which provides basis of detailed data for the finite element numerical calculation and construction of mine geological database and facilitates safety, stability analysis and monitoring work of the mine.