Nanoimprint graphoepitaxy is a simple way of fabricating molecularly oriented nano/microstructures. This paper describes our studies of the mechanism of the nanoimprint-graphoepitaxy-induced molecular orientation of P6CAM, a photo-cross-linkable liquid crystalline polymer. We describe the dependence of the molecular orientation of P6CAM on the nanoimprint process and the unique molecularly oriented patterns formed by nanoimprint graphoepitaxy.