To achieve the surface reconstruction for the triangle mesh of scattered data points,and overcome the shortcoming that the circle radius is difficult to identify for the existence of step edge on solid surface,the algorithm of generating triangular mesh by dynamic regulation of circle radius and implementing surface reconstruction is improved.The scattered data points are transformed into 2D image data and the image is meshed by triangle element.The experimental results show that the improved algorithm has a better reconstruction effect for solid surface with step edge although the efficiency decreases.