Clay　soils,　usually　in　an　unsaturated　state,　are　widely　used　as　barrier　materials　in　solid　waste　landfills.　When　the　saturation　of　clay　soils　is　high,　the　gas　phase　will　be　in　the　form　of　entrapped　bubbles.　The　entrapped　bubbles　can　directly　affect　the　soil　hydraulic　behavior,　which　further　affects　solute　transport　in　clay　liner.　Therefore,　based　on　the　stress　balance,　fluid　mass　conservation,　and　solute　mass　conservation　equations,　and　combined　with　the　relationship　between　pore　water　pressure　and　air　pressure　in　unsaturated　state,　a　coupled　hydro-mechanical-chemical　model　has　been　put　forward　to　study　the　influence　of　entrapped　bubbles　on　solute　transport　process.　Using　the　proposed　model,　a　series　of　numerical　calculations　are　carried　out　through　the　finite　element　simulation　software　COMSOL　Multiphysics.　The　numerical　results　show　that　the　increase　of　entrapped　bubble　content　can　enlarge　soil　deformation　and　slow　down　the　rates　of　excess　pore　fluid　pressure　dissipation　and　solute　transport.　In　particular,　when　the　degree　of　saturation　in　air　phase　increases　from　0　to　0.2,　the　difference　of　influence　depth　at　the　transport　time　10　years　reaches　28　cm,　and　the　breakthrough　time　of　solute　is　prolonged　by　17.8　years.