Disclosed are a method for forming an organic layer pattern which is characterized by forming a thin layer by coating a coating solution including a polyimide-based polymer having a heteroaromatic pendant group including a heteroatom in its polyimide major chain, a photoinitiator and a crosslinking agent on a substrate and drying the substrate, and exposing and developing the thin layer, an organic layer pattern prepared by the method, and an organic memory device comprising the pattern. According to example embodiments, a high-resolution micropattern may be formed without undergoing any expensive process, e.g., photoresist, leading to simplification of the preparation process and cost reduction.