本文从冻土与现代气候关系出发，理论上确定了冻土分区的界限。用剖面图展示出本区不同类型冻土分布的代表性高程，并以丰富的资料分析了出露在不同冻土区内的埋藏冻土层、冻土地貌假像、岛状冻土上限的起伏以及融冻地貌、植被变化等诸多现象呈现退化的一致性，得出了“退化是本区多年冻土变化的基本趋势”这一结论。 Based on the relationship between permafrost and modern climate, this paper theoretically determines the boundary of permafrost subarea. The profile shows the representative elevation of different types of permafrost distribution in this area. Based on the abundant data, it analyzes the buried frozen soil layer exposed in different permafrost regions, the frozen landform artifacts, the upper limit of island frozen soil Ups and downs, as well as the phenomenon of thawing and the change of vegetation showed the consistency of degradation. The conclusion that “degradation is the basic trend of permafrost change in this area” was obtained.