Abstract: The ecological system,as one of the vital factors to climate change,exerts impacton the earth at a full range of scales.In view of the fact that a draw back lies in employing climate models to simulate the effect of vegetation upon at mospheric circulation as a general practice,we propose a coupling model(R/S).A two-way coupling simulation from the NCAR's regional climate model REGCM2(called R-2 hereafter) and the SUCROS model for crop growth developed by the Wagening en Agricultural University,the Netherlands (both models,when in combination,denoted as R/S) are carried out on the interactions bet ween crops and at mosphere in Huang-Huai-Hai Plain.The experimental region(25-45°N,105-130°E) is in East China,with grid spacing of 60 km.Both models exchange information once a day.On a daily basis,the R-2 provides the SUCROS grid-points (in the box) with the total surface incident radiation,precipitation,maximal and minimal temperatures,mean vaporpressure and wind speed to drive its operation while the SUCROS furnishes the gridpoint LAI for the R-2.