The stratum lithology in Jiaodong Peninsula (Eastern Shandong Peninsula) is mostly magmatic and metamorphic rocks with great difference in water content. With the social and economic development, people's demand for a better life is constantly improving, and high-quality and stable underground drinking water has become one of the important livelihood issues for people in Jiaodong. Based on the summary of large-scale hydrogeological survey results and analysis of existing research results, combined with groundwater exploration cases, this paper analyzes the groundwater enrichment mechanism in magmatic areas from four aspects, namely hydrology, topography and geomorphology, aquifer lithology and geological structure. Five types of water storage structure models, such as fracture type, contact zone type, dike type, depression weathering zone type and multi-stage metamorphism, are put forward, and the characteristics of each type of water storage structure are analyzed. Meanwhile，the water search directions of fracture water in the distribution area of magmatic and metamorphic rocks is summarized, including weathering fracture water, structural fracture water and karst fracture water. It further enriched the study of water storage structure model in magmatic and metamorphic rock water shortage areas, and has a certain guiding role in the exploration of groundwater resources in this area.