Anodic porous alumina, which is formed by anodization of Al in an appropriate acidic solution, has recently attracted increasing attention as a key material for fabrication of functional nanodevices due to its naturally occurring self-ordered structure. We describe here the fabrication of the anodic porous alumina with modified pore shapes and its applications for template processes. Highly ordered anodic porous alumina with square and triangular cross sections were prepared based on the control of the initiation site of the hole development. The preparation of initiation sites for the hole development was carried out by imprinting Al using a mold with a patterned array of convexes. The obtained anodic porous alumina with modified pore shapes is useful as templates for the fabrication of several types of nanostructures.