A　new　method　of　analyzing　trace　2,4-Dichlorophenoxyacetic　acid　(2,4-D)　and　2-methy-4chloro-lphenoxyacetic　sodium　(MCPA　sodium)　in　soils　by　capillary　electrophoresis　(CE)　has　been　developed　in　this　study.　The　optimum　analytical　conditions　including　chemical　component　and　concentration　of　buffer　solution,　pH,　separation　voltage　and　sample　injection　time　were　studied　in　detail.　Under　the　optimum　conditions,　2,4-D　and　MCPA　sodium　in　soils　can　be　speedy　separated　and　determined　within　20　min　with　detection　limits　of　0.15　mu　g/g　(2,4-D)　and　0.25　mu　g/g　(MCPA　sodium),　a　RSD　(n=6)＜5%　and　a　recovery＞89%.　With　the　help　of　analytical　method　developed　in　this　study,　the　degradations　of　2,4-D　and　MCPA　sodium　in　natural　agriculture-soils　of　Fuzhou　were　studied.　The　experimental　results　indicated　that　the　degradations　of　2,4-D　and　MCPA　sodium　follow　first-order　kinetics　with　degradation　constants　of　0.1509　day(-1)　(2,4-D)　and　0.2722　day(-1)　(MCPA　sodium)　respectively.　The　degradation　half-life　were　calculated　to　be　4.6　days　(2,4-D)　and　2.6　days　(MCPA　sodium)　at　27　degrees　C,　implied　that　2,4-D　and　MCPA　sodium　can　be　speedy　degraded　in　natural　agriculture-soils　of　Fuzhou,　China.　(C)　2008　Elsevier　B.V.　All　rights　reserved.