以寒区气候和冻土变化及影响为主线，系统梳理回顾了张廷军教授在四十多年冻土研究中所作出的重要贡献。凝练总结了张廷军教授在量化多年冻土及地下冰分布和变化、厘清寒区特殊陆面过程关键要素的交互作用、发展冻土数值模拟模型和诊断分析方法以及发展冰冻圈遥感方法四个方面所作的创新性成果，基于这些成果发表的论文多已成为冻土与气候变化研究方面的经典，极大提高了对寒区气候、冻土分布及变化的物理基础的认识，为冰冻圈科学事业作出了不可磨灭的贡献。张廷军教授四十余载的求真求实之路同样值得我们学习和铭记。

This paper systematically reviews the significant contributions of Professor Zhang Tingjun in his 40 years’ academic research career， with the principal framework of climate and frozen soil changes in cold regions and their impacts. The selected publications mainly represent innovative achievements in the following four themes. （i） He investigated permafrost and ground ice distribution in the Northern Hemisphere， including Alaskan Arctic and high mountains in west China. He led the papers （in 1999 and 2000） that estimated permafrost area and ground ice volume based on the map compiled by the International Permafrost Association， which are widely recognized and cited. （ii） He explored the physical basis of the changing frozen ground， snow cover， and other related climate elements in cold regions to reveal potential interactions of key elements of the land surface processes. He synthetically summarized the impacts and physics of seasonal snow cover on frozen ground， which provides an essential start for the research on this topic. （iii） He made efforts to develop， improve， and apply numerical models that capture critical physical processes in frozen soils. His pioneering works on permafrost numerical modeling were beneficial， effective， and operational experiences for large-scale simulations of permafrost dynamics， beyond empirical and semi-empirical methods prior. （iv） He also established cryospheric remote sensing methods for detecting freeze-thaw cycles and seasonal snow cover. Many of these achievements have greatly improved the understanding of the physical basis of the changing cold regions and thus became classic literatures in the research of frozen ground and climate change. His 40-year life of pursuing truth is also worth learning and memorizing.