Abstract: The author considers that based on the geomorphologic site, stratigraphical correlation, material source, weathering degree and chronological data, division of the period of periglacial phenomenon could be made.But the distinction between syngenetic and epigenetic phenomena should be effected at the same time.The author further suggests that the term" paraperiglaciai age"be used to indicate the periglacial age in high mountains and on plateau at lower-middle latitudes, especially on Qinghai- Xizang plateau of extreme magnificent size or in unglaciated area of high latitudes during the interglacial period, for a lot of periglacial phenomena develop well at the same time. So the term"interperiglacial age"seems to be impertinent.