Abstract: In order to depict the hydrological process of urban areas, Simulating Model for Urban Water Cycle (URMOD) was developed by Department of Water Resources of China Institute of Water Resources and Hydropower Research. Using this model, the evapotranspiration (ET) process of the area inside the Fourth Ring Road of Beijing was simulated in the paper. During simulating period from 2002~2005, the results of simulated ET from grass cluster, tree cluster and water surface cluster were separately 578.4, 571.2 and 1130.5 mm, while the simulated ET from impervious cluster ranged from 161.0 to 269.1 mm. By comparison of simulated values and remote sensing derived results, there was a good agreement between monthly simulated ET and monthly remote sensing derived ET. URMOD is a well-performed tool to simulate regional ET in urban areas.