In view of many articles issued by Professor WANG Nai’ang and Academician LI Jijun questioning the Mount Mengshan glacier relics, this paper is written in the light of that academic debate is an effective way to approach the scientific truth. This paper focuses on two queries in WANG Nai’ang(2017b&): one is the use of artificial sampling pits as evidence for seismic impact pits; the other is the limitation of recognition of glacial striaes. This paper describes in detail the abundant types of glacial relics, such as glacial striaes, chatter marks, crescentic cracks, lunate fractures, crescentic gouges, nail- head and rat- tail shaped scratches in Mount Mengshan, and compares them with various scratches in the modern glacial trough of Hailuo Valley in Sichuan Province and chatter marks in Maine State, the United States. On this basis, the dynamic differences among glaciers, floods and debris flows are analyzed. It is found that if the basic cognitive category of “ice is solid” is broken away, it will inevitably lead to the flood of debris flow theory. The richness of the types of glacial striaes on Mount Mengshan glacier goes beyond the cognitive scope of some modern glacier researchers, which provides a reference for the study of Quaternary glacial relics in China.