Chitosan-stabilized　nano　zero-valent　iron　(CTS-nZVI)　prepared　by　the　liquid-phase　reduction　method　has　been　shown　to　achieve　a　good　dispersion　effect.　However,　there　has　been　little　analysis　on　the　mechanism　affecting　its　stability　and　transport　in　saturated　porous　media.　In　this　paper,　settling　experiments　were　conducted　to　study　the　stabilization　of　CTS-nZVI.　The　transport　of　CTS-nZVI　in　saturated　porous　media　at　different　influencing　factors　was　studied　by　sand　column　experiments.　The　stability　mechanism　of　CTS-nZVI　was　analyzed　from　the　point　of　view　of　colloidal　stability　by　settling　experiments　and　a　zeta　potential　test.　The　theoretical　model　of　colloidal　filtration　was　applied　for　the　calculation　of　transport　coefficients　on　the　basis　of　the　column　experiments　data.　Considering　attachment-detachment　effects,　a　particle　transport　model　was　built　using　HYDRUS-1D　software　to　analyze　the　transport　and　spatial　distribution　of　CTS-nZVI　in　a　sand　column.