In this paper, the stand biomass, carbon storage, accumulation and distribution of nutrient, hydrological processes and ecological function were investigated in the forest ecosystem of Alnus cremaslogyne at stand age 5,8 and 14 respectively, to study the structure and functional process of Alnus cremastogyne forest ecosystem. So as to reveal the response and feedback to global climate change of forest ecosystem, and to provide data bases and reference for formulating management mode of regional forest ecosy...