用计算机模拟 ,研究了电场下的团簇 -团簇凝聚 (CCA )和扩散限制凝聚 (DL A)的结构转变 .结果显示 ,当电场由弱到强时 ,凝聚体从典型的无序向有序结构转变 ,即从 DL A和扩散 CCA分形体向沿电场方向的链状结构转变 .凝聚体的偶分布函数显示 ,随着外场的增强 ,体系逐渐从局域有序向长程有序过渡 .这些结果有利于加深人们对电场下 CCA和 DL A的认识和电场下胶体聚集现象的理解 The structural transitions of cluster-cluster aggregation (CCA) and diffusion-limited aggregation (DL A) under electric field were studied by computer simulation.The results show that when the electric field changes from weak to strong, The transition from DL A to diffuse CCA fractal to the chain structure along the electric field.The even distribution functions of the aggregates show that the system gradually transitions from the local order to the long range with the enhancement of the external field. These results are helpful to deepen the understanding of CCA and DL A in electric field and the phenomenon of colloidal aggregation in electric field