A sunshine hours distribution model in mountainous areas is designed in this paper,and the effects of slope,aspect,shade on sunshine hours at different latitudes are also discussed.Results are as follows.The latitudinal character of sunshine hours is obvious;at the same latitude and in the same aspect,sunshine hours are reduced with the increase of slope;the effect of aspect on sunshine hours is complicated,and in different aspects,sunshine hours vary with seasons and slopes;the effect of shade on sunshine hours is obvious,and it affects the sunshine hours distribution,leading to the non-zonal distribution of sunshine hours,especially in winter when the sun altitude angle is low.The sunshine hours spatial distribution map of 1:1000000 in China under the condition of actual terrain is plotted.