Based on measurements from an experimental area and considering the characteristic shape of and the propagation properties of solar radiatio11 amongst the canopy of paulownia,a model is constructed for solar radiation distribution inside a patch with crop-paulownia intercropping at a range of densities under such skies as clear,cloudy and overcast.Compared to other analogs,the present model can better imitate the solar radiation pattern daily course in such fields,with the factors affecting the distribution investigated,thereby providing a basis for preparing an effective intercropping model.