Perpendicularly aligned and highly ordered Y-branched TiO2 nanotube arrays were fabricated by a simplified two-step electrochemical anodic oxidation method via reducing the anodizing voltage. The optimized growth-voltage range is between 28 and 20V. Different cross-sectional morphologies can be observed when the nanotube arrays are anodized under different voltage ranges. We illustrate here the synthesis process of Y-branched TiO2 nanotubes and a possible growth mechanism that leads to a variety of tubular branching morphologies.