Studying sedimentary characteristics of the Upper Xishanyao Formation,which is the main uranium-bearing stratum in Honghaigou area of southern margin in Ili Basin, will provide important theory evidence for further uranium exploration in study area. Based on the characters of sedimentary textures,lithologic associations,sedimentary rhythms,sedimentary structures,and logging curves,the Upper Xishanyao Formation can be considered as meandering channel facies in Honghaigou Area. Combined with the connected wells profiles,the lateral changes of sedimentary characteristics including the thickness of sand body,the ratio of sand to stratum,sedimentary facies of Middle Jurassic Upper Xishanyao Formation was clear,which showed that there was meandering channel along northwest-southeast in the middle part,a flood swamp in the south and a floodplain in the north. By summarizing and analyzing the metallogenic conditions in study area,including lithology,tectonic setting,and uranium source,the uranium ore bodies occurred in the Upper Xishanyao Formation in Honghaigou area were mainly controlled by the distribution direction, thickness, grain size,the mudstone intercalations in sandbody,and the occurrence of stratum.