Abstract: A new three-dimensional data model of tunnel had been put forward，semi-tunnel was as volume element to construct the 3D tunnel.According to this volume element，five basic modeling elements were abstracted to form the semi-tunnel.There were point，arc，feature connector line，tunnel section，and foundation surface.On the basis of analysis，data model of semi-tunnel，the eleven possible basic types of semi-tunnel were discussed in detail，and the illustrations of these types' three-dimensional model were given.On the foundation of these types volume element of semi-tunnels，it could build a model of simple tunnel，complex tunnel，and composite tunnel.In terms of above new three-dimensional data model，the complete underground mine tunnel network would be constructed.Thereby the study could enrich the theory of Digital mine，it was significant for development and safety production in mine.

Key words: Three Dimension, Simulation, Data model, Tunnel