High　accuracy　of　digital　elevation　models　(DEM)　data　is　used　as　basic　information　source　to　overlay　digital　slope　and　digital　aspect　models.　Based　on　a　distributed　model　for　calculating　monthly　astronomical　solar　radiation　of　with　a　resolution　of　90　m　×90　m　SRTM　(Shuttle　Radar　Topography　Mission)　DEM　for　the　rugged　topography　of　the　Wuyishan　mountainous　area　is　calculated.　This　paper　uses　ray-tracing　method　and　integral　by　subparagraph　to　calculate　the　conditions　of　terrain　shading　information,　and　through　an　integral　way　to　make　a　visualization　of　astronomical　solar　radiation　(ASR).