A　permeable　reactive　barrier　(PRB)　remediation　test　trough　with　coarse　sand-supported　zero-valent　iron　(ZVI)　composite　filler　was　designed　and　built.　Considering　the　convection-dispersion　and　chemical　reaction　of　2,4-dichlorophenol　(2,4-DCP)　in　groundwater,　a　coupled　model　of　chemical　reaction　and　solute　transport　of　2,4-DCP　was　built.　The　adsorption　kinetics　data　of　2,4-DCP　were　fitted,　the　results　showed　the　pseudo-second-order　kinetic　model　could　better　describe　2,4-DCP　adsorption　process　than　the　pseudo-first-order　kinetic　model.　The　model　parameters　were　determined　by　static　adsorption　test　and　continuous　flow　dynamic　tracer　test.　Compared　with　the　linear　model　and　the　Langmuir　model,　the　Freundlich　model　fits　better　with　the　adsorption　test　data,　it　shows　that　the　adsorption　of　2,4-DCP　by　coarse　sand　and　coarse　sand-supported　ZVI　filler　was　more　in　line　with　the　Freundlich　model.　A　Freundlich　model　showed　a　satisfactory　fit　to　the　equilibrium　adsorption　data　with　a　correlation　coefficient　R-2　=　0.968　for　coarse　sand　and　R-2　=　0.954　for　coarse　sand-supported　ZVI.　The　adsorption　coefficient　K-F　of　2,4-DCP　on　coarse　sand　and　coarse　sand-supported　ZVI　are　4.456　x　10(-6)　and　0.00846　respectively,　the　dispersion　coefficient　is　0.345　cm(2)/min,　the　porosity　is　0.38,　the　specific　yield　is　0.1,　the　permeability　coefficient　is　4.15　x　10(-2)　cm/s,　and　the　seepage　velocity　is　1.245　x　10(-4)　cm/s.　The　FEMWATER　software　and　the　TOUGHREACT　software　are　used　to　calculate　the　coupling　model　to　simulate　the　migration　and　transformation　process　of　2,4-DCP　in　groundwater.　The　results　show　that　the　calculated　values　by　software　TOUGHREACT　do　not　agree　well　with　the　measured　values　for　the　failure　zone　of　composite　filler,　the　values　calculated　by　software　FEMWATER　has　better　fitting　effect　with　the　measured　values.