One of the major natural causes for the permafrost degradation is climate warming,particularly that in winter,timing of rainfall and snowfall,and duration and thickness of snow cover.

The climate change and the intensifying human activity cause the permafrost degradation in Northeast China.

Briefly presents the research achievements concerning the deterioration law of physical and mechan-ical behavior of structural materials such as reinforcements,prestressing tendons,concrete,etc under and after high temperature.

The research about degenerative frozen soil for ages at the Xiaoxinganling region and frozen soil test at the Wuying-Tangwanghe section of the Yijia highway;