Abstract: It is used the data of radiation and meteorological elements from 119 meteorological stations from the year 1961 to 2017 in the whole region. According to the meteorological industry standard "Solar Energy Resources Assessment Method"（QX/T89—2018）,the whole area will be divided into three zones:solar energy resource-rich area,solar energy resource-rich area and solar energy resource-rich best area. Selection of regional representative stations,The temporal and spatial variations of solar radiation and its influencing factors were analyzed. The results show that the distribution of solar radiation decreases from west to East and from south to north. The variation trend of solar radiation in the whole region decreases first,and then increases slowly,and between 1980-1990,the radiation amount reached the lowest level. The radiation quantity is affected by season. It fluctuates greatly in summer,secondly in spring,and is basically stable in autumn and winter. The meteorological factors affecting the change of radiation are mainly cloudiness,and the cloud cover directly affects the solar radiation. The influence of visibility on solar radiation mainly depends on the concentration of aerosol particles. Increasing the concentration will lead to the scattering and refraction of solar radiation and the decrease of solar radiation reaching the ground.