| In ecosystem, soil microorganism plays a significant role in nutrient conversion and decomposition and it can be used as an important index of soil quality. Soil phyical and chemical index, as well as functional diversity of soil microbial community, were studied to provide some theoritical basis for the recovery of alpine meadow. Using chloroform fumigation and BIOLOG-ECO technology, functional diversity of soil microbial community were studied in a successional sequence of abandoned-fields in sub-alpine meadow in the eastern Tibetan Plateau China. The results showed that abandoned time and fire had a great impact on soil microbial diversity. The data of 2009 showed that soil of 11 year fallow time had the biggest value of soil bulk density and soil moisture and the highest utilization ability of carbon source and the physiological metabolic activity. Changes of average well color development (AWCD) were most significant during 0～168h. Soil microbial biomass carbon and organic carbon were relatively higher; soil microbial community richness, evenness, and diversity index were relatively higher. These indicated that 11 year fallow time had the biggest influence on functional diversity of soil microbial community. Using BIOLOG system,22 species of bacteria were identified in this experiment, of which 5 species were unreliable because their SIM values were lower than 0.5. The data of 2010 showed that soil of 9 year fallow time had the biggest value of moisture and pH and the highest utilization ability of carbon source and the physiological metabolic activity, changes of average well color development (AWCD) were most significant during 0～168h, soil microbial community richness, evenness, and diversity index were relatively higher, these indicated that fire had a great impact on soil microbial functional diversity.
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