The growth pattern of wheat planted on ridges and corn in furrows with plastic canopy on striped rainfed farmland is superior to the presently extended growth pattern of wheat planted in furrows and corn on ridges,both mulched.In the symbiotic stage,crops have the equitable effect upon mutual water regulation,coordination and balance of water requirements by wheat and corn in the different deve lopment stages.Therefore,the crop living condition would be more suitable,and the structure of colony more coordinative.The former can raise crop yield by 9 0%～12 5% in contrast to the latter.