In recent years, the research on the concept of cultural memory and its carrier has become a hot topic in academia. The concept of "cultural memory" was first proposed by the German cultural scholar Jan Assmann. He drew the memory discourse into the theoretical framework of cultural studies, and expressed the cultural and identity function of memory from the external dimension of human memory. On this basis, he systematically explained the construction theory of cultural memory. In order to clarify the concept of cultural memory by Jan Assmann, this paper intends to examine the theoretical connotation of cultural memory from the spatial and temporal dimensions. It not only shows the profound space-time contained in cultural memory, witnesses the "inexhaustible visual explosive power in space" and "unweakened continuous ability in time" of cultural memory, and explains the healing power of cultural memory in time and space shuttle. At the same time, with the spatial return and time reconstruction of cultural memory as the breakthrough point, the dynamic process of the spatial and temporal construction of cultural memory is sketched out, and the meaning code of memory is broken, so as to explore the essence and significance of the theory of cultural memory theory.