The　model　to　predict　particle　deposition　velocity　on　rough　walls　in　fully　developed　turbulent　duct　flows　has　been　developed　in　previous　studies.　For　particle　deposition　model　boundary　conditions,　it　is　assumed　that　the　concentration　of　the　particle　is　zero　on　the　surface　and　the　resuspension　velocity　is　constant.　However,　the　resuspension　velocity　may　not　be　constant　with　the　increase　in　mass　of　the　deposited　dust.　To　analyze　the　behavior　of　resuspension　in　air　flow,　a　set　of　experiments　were　designed　and　conducted.　Results　showed　that　there　was　a　linear　relationship　between　the　mass　of　resuspension　and　deposited　dust.　Also,　the　particle　deposition　model　was　improved　by　adding　a　resuspension　item　to　the　equation,　and　the　steady-state　equation　was　developed　into　a　time-varying　equation.　The　analysis　results　are　presented　in　this　paper.