The　consolidation　behavior　of　cohesive　soils　has　an　important　effect　on　the　contaminant　transport　in　a　clay　layer.　In　the　current　time　the　research　on　contaminant　transport　in　deforming　porous　media　has　not　yet　begun　in　China;　even　in　other　countries　this　work　only　began　some　years　ago.　Combining　Biot＇s　consolidation　theory　with　the　contaminant　transport　theory,　a　one-dimensional　mathematical　model　for　contaminant　transport　in　clay　layers　is　developed.　The　main　feature　of　the　model　is　considering　the　effect　of　soil　deformation　under　loads　on　contaminant　transport.　The　analytic　solution　of　the　model　is　then　given　based　on　some　reasonable　assumptions.　Finally,　the　calculation　results　are　compared　with　the　results　measured　in　a　disposal　site　for　the　contaminated　dredged　sediments　from　the　Taihu　Lake.　The　simulated　result　has　reflected　the　transport　of　contaminant　in　the　actual　soil　layer.