ield water consumption,constitution,variational law ,and utilization degree of availablesoil water for the main crop components in the complex crop systems were studied in this pa-per,and at the same time the field water consumption and its constitution for diffenent com-plex crop systems was also examined based on the soil water observations from the experi-ments of crop rotations with multiple cropping conducted on the tablelands of the EasternGansu Loess Plateau during 1988-1991. The results showed tha...