The connection between different plant systems and runoff from sloping fields was studied and discussed for the periods 1994-1996 and 2001-2002.These data indicated that farmland runoff increased markedly after barren sloping field was exploited.There were differences in effect on runoff of different plant systems.From 1994 to 1996，relative runoff under different plant systems was:paddy-wheat>maize-buckwheat-barley> peanut-buckwheat> red potato-wheat.During 2001-2002，the relationship was:peanut>maize-radish i peanut-cole>fruit tree-peanut Ontercrop).Runoff under a solop plant was greater than that under a rotatation system，and that under a rotatation system was greater than that under a fruit growing intercrop system.Also，higher plant coverage resulted in the less runoff.Managing measures on farm and the characteristics of the plant systems used were key factors affecting runoff.