A simple and low-cost process of imprinting-induced cracks is proposed to fabricate controllable nanochannel structures with high depth-to-width ratio, in ultraviolet (UV) curable photoresist. The nanochannels are formed by the cracks of UV-curable photoresist due to its volume reduction as a result of solidification, with imprinting induced predesigned crack patterns. The proposed process is demonstrated with a nanochannel structure consisting of a periodically distributed hexagonal 30 nm-width and 100 nm-depth channels, which is fabricated by anodic aluminum oxide template imprinting induced cracks on a thiolene UV-curable photoresist. A finite element analysis provided theoretical foundation for the process, shedding lights on the parameters influencing the process. (C) 2014 AIP Publishing LLC.