The morphology of anodic alumina films and membranes has been simulated. The model takes into account : (1) the number of potential centres of anodic oxidation; (2) the mean distance between these centers; (3) the creation of a triangular network in order to anodize all the aluminium surface; and (4) the heterogeneous composition of cells. The general distribution of the cells has been recreated and characterized using a radial function of distribution. The area of cells is made up of three parts : the pore, anion-contaminated alumina, and relatively pure alumina. The relative proportions of each part have been calculated as a function of the cell size and experimentally determined relations. Different stages of the dissolution of anodic alumina, which lead to changing pore sizes and shapes, have also been simulated using the experimentally determined rates of solubility for anion-contaminated and relatively pure alumina. Very good agreement has been observed between morphology and pore structure of simulated and real anodic alumina films and membranes.