Abstract:The evolutional characteristics and mechanism of farmland ecosystem in Longjing county are studied in this paper in terms of macroscopic view. The models on system function in response to anthropological factor and natural factor are established, and measures that should be taken for further steady development of the system are proposed. Result from analysis shows that there are 3 obvious characteristics on evolution of farmland ecosystem since 1949. (1) The System function have rosen fluctuationa-lly with ...