Abstract: Through analysing the way to realize the 3D pipe visualization model, constructing its digital model, and adopting Flt document, the paper proposes the automatic construction technology of 3D pipe model based on the survey data, blueprint and CAD document format DXF. On the basis of Vega Prime, such Flt models as buildings, underground rock layers and pipes can be introduced to the system and can be driven jointly. Through the above-mentioned technologies, fast modeling of urban underground pipes and 3D visualizational browzing are realized.

Key words: computer application, 3D visualization, modeling, underground pipe