Combining　Biot＇s　consolidation　theory　with　contaminant　transport　theory,　a　one-dimensional　mathematical　model　for　contaminant　transport　in　clay　layers　is　developed.　The　distinct　feature　of　the　model　is　that　the　effect　of　soil　deformation　on　contaminant　transport　is　considered.　Analytic　solution　of　the　model　is　sought　by　using　reasonable　assumptions,　with　the　attenuation　of　contaminated　fountain　concentration　being　taken　into　account.　The　concentration　distribution　of　a　major　contaminant　in　the　Taihu　dredged　sediment　field　is　calculated,　and　the　results　indicate　that　the　depth　of　contaminant　transport　with　soil　consolidation　is　smaller　than　that　without　soil　consolidation.