【英文摘要】In the course of the study on the frozen stagnant water formation mechanism 49662009, the study showed, it was an important component of water factor of eco-environment and it had the effect to maintain ecological balance or imbalance. Issued relative papers about the frozen stagnant water had been recognized, supported and rewarded by domestic and foreign experts. So it was determined the direction. Details of the study are that they were including in the three-north area of China different eco-environment of the freezing-melting water quantities, resorted time and its dynamic changes. It was the relativity to eco-environment factors, the unique inverted water abundance of the frozen stagnant water, especially unique inverted water abundance, the ecological environment of the factors, and water metabolism during trees dormant period. In drainage areas of woods’ areas water balance calculations could identify the development trends to woods wetlands and forest ecology. The results were that it broke through traditional concepts, and extended a new cross-studying field to the hydrogeology and the eco-environment. The study revealed the "the frozen earth" was the containing water layer, and it was the essential result for “the frozen earth disaster” by the freezing-melting physical change of the frozen stagnant water. The study identified that the frozen stagnant water was the indispensable water resources for plant survival in trees dormant period. The optimum average water content for the frozen stagnant water was 20~40%. Leading the frozen stagnant water concepts, theories and technique to forest ecology subject, the study further widened the interdisciplinary research fields of the hydrogeology and ecology, physiology. It had an important academic value to develop academic disciplines with theoretical and practical significance to break through the new question to trees’ water metabolic quantity and mechanisms during the period of trees’ winter dormancy. The study had issued 13 papers. 16 researchers participated in domestic and international seminars and academic conferences in the Mainland and Hong Kong many times.