Granular　materials　flow　remains　an　outstanding　issue　in　both　nature　and　industry　where　typically　a　range　of　particle　sizes　are　involved.　The　mixing　and　segregation　processes　of　binary　granular　mixture　with　particles　of　identical　sizes　and　with　different　densities　subjected　to　vertical　oscillatory　excitation　are　investigated.　The　DEM　experiments　are　conducted　in　the　PFC3D,　and　the　material　parameters　are　fixed　through　the　comparison　between　the　numerical　and　laboratory　experiments.　Firstly,　the　deposition　patterns　of　particles　in　different　constraint　chutes　are　studied.　Secondly,　the　kinetic　mechanism　between　uniform　particles　and　mixed　particles　is　compared,　and　the　regular　patterns　are　revealed.　Finally,　different　kinetic　mechanisms　of　the　particles　in　different　constraint　chutes　are　studied,　and　it　is　proved　that　the　mixed　particles　under　constraint　conditions　get　more　kinetic　energies　and　have　a　longer　runout.　©　2016,　Chinese　Society　of　Civil　Engineering.　All　right　reserved.