The paper introduces the threedimensional (3D) visualization for weather radar base data through 3D interpolation and VTK (Visualization Toolkit) based on the Weather Radar Base Data Structure Analysis Software developed by the authors, which is in favour of various operating systems.The 3D reconstruction supports several interactive operating systems and rapidly highlights the structural features of radar echo, such as allowing the 3D reconstruction in any rectangular region on radar plan, supporting the superposition of terrain and radar echo, having the functions of zoom, roam and viewpoint change, providing the adjustment of transparency and illumination coefficient of different intensity intervals and getting the section view and 3D view of different kinds. Finally, the paper shows how the 3D reconstruction helps forecasters rapidly grasp storm structures and their evolution rules according to the situations, including the severe convection cell and typhoon where this software applies.