Social studies are located as the central subject of school-base law-related education(LRE), but efforts to confirm and improve the current status and characteristics of LRE pursued in social studies are insufficient. The purpose of this study is to identify the law-related content system of the 2015 revised social studies curriculum in order to systematize the content of LRE, and to critically analyze the key concepts and generalized knowledges that are the main components of the content system. The results of this study are as follows. First, the key concepts in the law-related content in social studies curriculum were composed of subject words whose standards or criteria were unclear. Second, the key concepts consisted of contents whose transfer was unclear. Third, the relationship between generalized knowledges and core concepts was unclear. Fourth, generalized knowledges in the law-related content consisted of descriptive generalization and cause-and-effect generalization. Fifth, generalized knowledges are not systematically linked to sub-elements. Sixth, there was a partial gap in the lines of the key concepts and generalized knowledges by grades. Therefore, the tasks to establish the content system of LRE in Korean social studies curriculum are as follows. First, in order to establish key concepts and generalized knowledges, it is necessary to seek joint research by professional researchers in law and social studies education. Second, key concepts must be reorganized so that they can become the basis of generalized knowledges, content elements, and functions as big ideas. Third, it should be presented with a high level of generalization so that generalized knowledges can play the role of an organizer connecting content elements and skills of all grades.