From the Project for Intercomparison of Land-surface Schemes (PILPS) results, the importance of landsurface process parameterizations in the climate modelling has been appreciated. Under the same climate regime, landsurface schemes show large inconsistencies in their simulation of surface energy and water partitions. As increasing attention is paid to the role of landsurface processes under different climate scenarios PILPS' intercomparisons can and should be extended to encompass sensitivity to increased greenhouse gases. In this paper we have analysed the potential impacts of tropical deforestation on the greenhouse-warmed climate based upon the experiments of a version of NCAR Community Climate Model (CCM1-Oz). The combined impacts of tropical deforestation and greenhouse warming are assessed by an experiment in which removal of tropical rainforests is imposed into a greenhouse-warmed climate. Results show that the combined climate changes over tropical rainforest regions comprise large reductions in surface evapotranspiration (by about -180 mm/yr) and precipitation (by about -312 mm/yr) over the Amazon Basin, along with an increase of surface temperature by +3.0 K. Over S.E. Asia and tropical Africa, similar but much weaker changes are found in this study. Changes of surface energy budget demonstrate that the large increase of surface temperature is not solely produced by the increase of atmospheric CO2 concentration, but it is a joint effect of the reduction of surface evaporation and the increase of downward atmospheric longwave radiation in the combined experiment. Furthermore, impacts of tropical deforestation on the greenhouse-warmed climate are estimated by comparing a pair of deforestation simulations. It is found that in CCM1-Oz, deforestation has similar impacts on the greenhouse-warmed regional climates as on the current climates over tropical rainforest regions. The physical processes responsible for the regional impacts remain. However, as greenhouse warming may intensify the global atmospheric circulation, results in this study suggests that greenhouse warming might increase the possibility of tropical deforestation affecting extra-tropical climates.