Solute　transport　through　the　day　liner　is　a　significant　process　in　many　waste　landfills　or　unmanaged　landfills.　At　present,　researchers　mainly　focus　on　the　test　study　about　semi-membrane　property　of　clay　material,　however,　the　influence　of　chemical　osmosis　caused　by　membrane　effect　on　solute　transport　and　fluid　velocity　is　insufficient.　In　this　investigation,　based　on　the　classical　advection-diffusion　equation,　a　one-dimensional　solute　transport　model　for　low-permeable　clay　material　has　been　proposed,　in　which　the　coupled　fluid　velocity　related　with　hydraulic　gradient　and　concentration　gradient　is　introduced,　and　the　semi-membrane　effect　is　embodied　in　the　diffusion　mechanism.　The　influence　of　chemical　osmosis　on　fluid　velocity　and　solute　transport　has　been　analyzed　using　COMSOL　Multiphysics　software.　The　simulated　results　show　that　chemical　osmosis　has　a　significant　retarded　action　on　fluid　velocity　and　pollutant　transport.　The　proposed　model　can　effectively　reveal　the　change　in　process　of　coupled　fluid　velocity　under　dual　gradient　and　solute　transport,　which　can　provide　a　theoretical　guidance　for　similar　fluid　movement　in　engineering.