PHREEQC　software　was　used　to　study　the　chemical　form　of　uranium　based　on　the　chemical　composition　of　groundwater　from　a　low-level　radioactive　waste　repository　located　in　southwest　China.　The　effects　of　pH,　temperature,　and　pE　(the　equilibrium　state　of　electronic　activity)　on　the　distribution　in　uranium　chemical　form　were　studied.　The　results　show　that　uranium　presents　in　the　VI　chemical　valence　and　[UO2(CO3)(2)](2-),　[UO2(CO3)(3)](4-),　and　UO(2)CO(3)forms　when　pH=7.6,　T=12.2　degrees　C,　and　pE=4　in　groundwater.　Temperature　and　pH　strongly　impact　the　distribution　of　the　uranium　chemical　form.　However,　pE　has　little　effect　on　the　chemical　form　distribution.　Therefore,　pH　and　groundwater　temperature　should　be　taken　key　considerations　during　the　selection　of　waste　landfill　sites.