【英文摘要】Estimation of the magnitude, spatial and temporal variations of evapotranspiration iscentral to the analysis of regional water balances, especially for arid region in Central-Asia. Central-Asia has experienced a large-scale land use/cover change (LUCC) during the last half century due to dramatic human activity (e.g. oasis development, urbanization, hydraulic engineering construction and grazing). While we have a qualitative sense that land transformations across Central-Asia have affected regional evapotranspiration greatly, our challenge now is to quantify exactly how evapotranspiration has changed due to human-induced LUCC. Here, we propose an integrateresearch method to combine field measurement, remote-sensing data and mathematic model at multi-scale to quantify the consequences of LUCC on evapotranspiration across Central-Asia. We will document the patterns of land-use change and its characteristic across Central-Asia since 1980 to present. We will also examine how evapotranspiration have changed as a result of human-induced LUCC and climate change using integrated Dynamic Land Ecosystem Model. Model estimates along with spatial and temporal patterns of evapotranspiration will be compared to remote sensing-based model estimates one. Bothof these models will be calibrated and validated using field measured evapotranspiration. Finally, we will explore the consequence of regional evapotranspiration variation on groundwater, vegetation and lakes. The policy implication will proposed based on this study for optimizing the management and allocation strategy of soil and water resource in Central-Asia.