运用扩散有限凝聚模型模拟在直角网格、正三角形网格、正六边形网格中的树状分形结构.此外，为消除运动方向所 带来的影响，以金属小球在电场中运动来模拟树状分形结构的生成.对不同线电荷密度的模拟结果利用Sandbox 方法计算相 应的分维数，得到分维数随着线电荷密度的增加而减少的现象符合已有实验的结果.

Using the diffusion limited aggregation model in Cartesian grid，equilateral triangle mesh and hexagonal mesh，we simulate the tree fractal structures. For avoiding the impact of the direction of the movement，we simulate the metal ball movement in the electro fields to generate the fractal structures. The results of fractal dimensions of different charge densities are obtained by using the Sandbox method. The fractal dimension decreases when the charge density increases. It confirms to the experimental result