Guanyinshan copper deposit, located in Dongchuan, is one sedimentary-hydrothermal reformation type, belonging to ‘five-story’ metallogenic series with ‘cooper-up-iron-down’ spatial structure. This paper analyzes its deposit geology, mineralization conditions and genesis based on research results. The major orebodies are hosted in Member 2 of Dayingpan formation (Pt?d2) carbonaceous-siliceous slate occurring as stratified or lens-like with 3 ore beds. Metallic minerals are mainly chalcopyrite and pyrite with secondary malachite, textures are vein-like, striped or disseminated. Deposit is formed under control of sedimentary structural environment, lithofacies paleogeography and ore-bearing formation, generally a sedimentary meta-reformed cooper deposit in sandy shale-debris formation. Guanyinshan cooper deposit is exclusively of typical strata, lithofacies and locality. Dayingpan strata are well exposed in its west, where may be of potential to look for Guanyinshan-style cooper deposits. 