Abstract: An urban ecosystem is a kind of large-scale complex system. Because of its multi-level complicaterelations,dynamic features and long time-delay characteristics,no perfect method can simulateits whole development process accurately. In this paper,a man-computer interactive simulationmethod of urban ecosystem is presented based on comprehensive analysis of the existingsimulation methods. According to the new method,the problems,processes and policies of anurban ecosystem can be simulated by choosing suitable models.

Key words: wind-water alternate erosion, sediment-yielding process, erosion mechanism, simulation experiment.