The spatial distribution patterns of direct solar radiation were investigated in Jieba mountain based on the function of solar radiation calculation in ViewGIS.The purpose of this study is to provide preliminary data and scientific evidences for regional planning and environmental construction.The results of spatiotemporal distribution analysis show that the direct radiation increased with the elevation.Greater amount of radiation were found at plantation and less at lower parts of the hills.The calculated radiations were found in descending order at the locations of plantation

flood land

summit

middle and upper part of hill

gully

and lower part of hill.On the other hand

direct radiation decreased with the increase of slope degree.The direct radiation also varied with slope aspects;sunny slope

semi-sunny slope

semi-shady slope

and shady slope had direct radiation in descending order.