This　study　examines　the　adsorption　and　desorption　characteristics　of　heavy　metals　in　road　dust　(RD)　for　the　aspect　of　integrated　stormwater　management.　The　chemical　fractionations　of　Cu,　Zn,　Ni,　and　Cd　were　determined　by　a　three-step　sequential　extraction　protocol.　Pseudo-first-order　and　Pseudo-second-order　kinetic　models,　along　with　Langmuir,　Freundlich,　and　Temkin　isotherms　were　adopted　to　simulate　the　batch　experimental　data.　The　proportional　shift　of　metals＇　chemical　fractionations　in　original　RD,　adsorption　equilibrium,　and　desorption　equilibrium　were　determined.　Results　show　that　RD　has　a　remarkable　affinity　to　adsorb　heavy　metal　within　a　short　time.　The　adsorption　processes　were　well　described　by　the　Pseudo-second-order　kinetic　model　(R-2　=　0.98-0.99)　and　Freundlich　isotherm　(R-2　=　0.89-0.98)　for　most　of　the　given　metals　indicating　that　the　chemical　adsorption　was　probably　the　rate-controlling　step　and　the　binding　energy　for　each　site　was　not　identical.　The　maximum　adsorption　capacities　for　Cu,　Cd,　Zn,　and　Ni　were　6300　mg　kg(-1),　5800　mg　kg(-1),　4000　mg　kg(-1),　and　3200　mg　kg(-1),　respectively.　A　linear　fit　to　the　equilibrium　pH　and　the　total　amounts　of　the　adsorbed　metals　indicates　a　strong　pH-dependent　adsorption.　According　to　the　proportional　shift　of　metals＇　chemical　fractionations　during　the　adsorption　and　desorption　processes,　the　exchangeable　fractions　of　heavy　metals　in　RD　were　irreversible.　It　suggests　that　a　portion　of　the　surface　sites　of　RD　would　be　not　exchangeable　once　it　was　occupied.