Abstract: Based on practice,a two-ways transformational method is put forward for system structuralregulating and applied to the designing of agro-ecolomic system.This method is a new wayfor the coordination of overall system objective and subsystem objectives,which has boththeoretical significance and important practical values in solving problems coupling with theagroecological construction of arid and semi-arid regions and in regulating and designing ofagro-ecolomic system.

Key words: Intermittent irrigation, Evaporation, Transpiration, Percolation, Rice