One of the common features between the Qinghai-Tibet Plateau and the circum-Arctic region is the presence of a large areal extent of frozen ground. Changes in frozen ground， including those of the past reconstructions and future predictions， are of great significance for the study of the triple pole linkage， one of the hot issues in the studies on global climate change. Based on the published scientific literature and assessment reports， we systematically summarize the study results of changes in frozen ground in the five aspects， including permafrost area， mean annual ground temperature （MAGT）， active layer thickness （ALT）， near-surface freezing-thawing status， and frost depth in these two regions. Results show that， based on different methods， permafrost area decreases， MAGT increases， ALT enlarges， duration of ground freezing decreases， and frost depth declines but with some differences with different methods. In future studies， it deems necessary to further strengthen the frozen ground monitoring， better understand physical processes and the interaction mechanisms between frozen ground and climate and environment， and take into account of the influences of lateral heat flow in predictive models. These progresses will provide data and methods for supporting for higher-precision model simulations and predictions in the future. The summary in this study can provide some ideas for the future study on frozen ground and provide references for engineering design and construction in cold regions. It also gives warning for people to recognize that changes in frozen ground environment may lead related hazards， and emphasize the importance of human protection on the frozen ground environment.