Abstract: The frozen soil has very special engineering geological properties,which is widely distributed in the Qingzang plateau of China.Recently,due to the economic development, tourism, national defense construction and traffic increase, some construction has been constructed on the frozen soil.Therefore,most of the engineers have met the very complicated engineering geology and geotechnical problems of frozen soil. The mechanics properties, ground treatment and environment variation of frozen soil are summarized. It will be a good prospect of frozen soil research. It is useful to engineering construction in permafrost areas of China, especially to Qinghai Tibet Raiway.