Abstract: Aiming at the actuality of the imperfection and low application rate of the model-building technique of mine ramp，we research the method of 3D-modeling based on parametric idea.Firstly，we build a parameterized 2D model contour of the ramp according to its cross section parameters.Secondly，building a 3D model contour of the ramp sections via coordinate transformations on the basis of the parameters of its path.And then，a 3D model of the ramp is quickly created according to the algorithm which utilize the side face of consecutive cross section.Finally，the model parameters are saved in its corresponding database so that we may finger up the engineering data and query or modify the model dynamically.With the help of the method mentioned above，together with HOOPS components and VC++ tools，we develop a parametric modeling system of the mine ramp.Based on this system and the planar graph，gradients and other parameters of a mine ramp，we built a parameterized 3D model for the ramp and modified it as the condition changed during the construction process of the mine ramp.

Key words: Ramp, Parametric modeling, HOOPS, Dynamic modifying