Vibration　of　a　cross-laminated　timber　(CLT)　floor　is　strongly　related　to　its　boundary　conditions.　In　this　study,　the　effect　of　beam　spacing,　beam　size　and　supporting　conditions　on　the　dynamic　behaviours　of　CLT　floors　were　investigated.　To　this　end,　the　open-source　software　framework　Open　Software　for　Earthquake　Engineering　Simulation　(OPENSEES)　was　used　to　simulate　the　dynamic　performance　of　CLT　floors　and　the　simulated　results　were　validated　against　the　results　of　onsite　experiments.　OPENSEES　is　under　continual　development,　and　is　mainly　used　to　develop　applications　for　simulating　the　behaviour　of　structures　and　geotechnical　systems　under　seismic　excitations.　In　this　study,　a　novel　model　was　developed　to　enable　OPENSEES　to　carry　out　foot-fall　analyses.　Moreover,　an　analytical　model　was　established　to　enable　engineers　to　quickly　estimate　the　relevant　dynamic　properties　of　CLT　floors　with　different　boundary　conditions.　The　simulated　results　agreed　well　with　the　experimental　data.　According　to　those　simulated　results,　increasing　the　spacing　between　the　beams　would　reduce　the　natural　frequency　and　increase　the　vibration　acceleration　significantly.　Moreover,　the　results　indicate　that　increasing　the　beam　stiffness　up　to　a　certain　level　would　increase　the　natural　frequency　of　the　CLT　floors,　and　consequently　enhance　their　serviceability　performance.　The　one-way　and　two-way　CLT　floors　show　little　difference　in　vibration　performance　when　the　beams　can　provide　sufficient　support.