Geo-information Tupu, which is the origin of the geomorphic information spectrum, is introduced and the concept and development of the geomorphic information spectrum are then discussed. From the perspective of specific research, the research types and status of the geomorphic information spectrum are summarized, including the geomorphic morphological characteristic spectrum (such as, surface slope spectrum, section spectrum, two-dimensional pattern spectrum, and topographic texture spectrum) and the geomorphic development spectrum. Combined with the development of remote sensing, computers, artificial intelligence, and other technologies, the prospect of the combination of knowledge graph and information spectrum in future geomorphic research is analyzed, and the research progress and key technologies of geomorphic information spectrum such as geomorphic information extraction, geomorphic information classification, and geomorphic mapping are summarized. The future development of geomorphic information spectrum is prospected using three aspects: constructing a complete geomorphic information spectrum system, improving key technologies of geomorphic information spectrum, and strengthening the refinement and quantitative research of global geomorphic patterns and evolution. This study can provide a reference for the digitization, informatization, and intellectualization of digital geomorphology to serve as the major strategy for the management of national resources and the environment and promote the development of geomorphology.