The　dispersion,　convection,　adsorption　and　degradation　of　contaminant　have　been　calculated　in　classical　contaminant　transport　model,　but　the　self-attenuation　of　contaminated　source　concentration　hasn＇t　considered.　The　concentrate　is　often　decreased　as　a　rule　in　actual　engineering　whether　filtrate　concentration　of　garbage　landfill　or　substrate　sludge　concentration　of　dredging　heap.　The　index　form　of　contaminated　source　concentrate　attenuation　with　time　is　given　as　preliminary　research,　and　the　analytic　solution　of　established　contaminant　transport　model　is　also　given.　In　the　end,　the　transport　situation　of　contaminant　in　Beijing　area　on　different　kinds　of　soil　which　are　clay,　heave　silty　clay,　silty　clay　and　clay　silt　has　been　simulated　according　to　the　model　solution.