针对MC (Marching Cubes)算法重建后模型表面的不光滑性和模型表面三角面片数量大的缺点，提出了在保证一定精度的前提下减少小面片的处理方式。通过对等值面进行三维空间上的方向平滑来代替等值面上的三维坐标平滑，达到了提高模型表面平滑性的目的。以边删除算法为基础，设计了网格简化算法，实现了模型表面的网格简化。以喉管和心血管两组磁共振(Magnetic Resonance，MR)体数据为例进行三维表面重建的结果表明，平滑后的三维显示效果有了显著改善，显示的结构细节清晰度与真实感明显提高。模型的网格简化90%后，依然能保持原模型的特征和较好的视觉效果，并大大提高了实时交互绘制的能力，明显缩短了交互操作时间。

Marching Cubes (MC) algorithm has disadvantages of bad-surface of 3D surface model and triangle redundancy. To improve this algorithm performance, smoothing for iso-surface and edge deleting algorithm to simplify the meshes are presented. The direction smooth of the three-dimensional space on the iso-surface was used to replace the smooth of three-dimensional coordinates on the iso-surface, and the smoothness of the model surface was improved. Based on the edge deletion algorithm, a mesh simplification algorithm was designed to simplify the model surface mesh. Two groups of Magnetic Resonance (MR) data (hollow throat and cardiovascular system) were used to actualize three-dimensional surface reconstruction. Running examples show that the smoothed three-dimensional display has been improved significantly, and the clarity and realism of the structural details improved obviously. After 90% mesh of the model had been reduced, the model can still maintain the original features and good visual effects, and the ability of real-time interactive rendering was enhanced greatly, the interaction time was reduced evidently.