After　successfully　biding　to　host　the　2022　Winter　Olympic　Games　in　Beijing,　Chinese　sports　development　opened　a　new　chapter　and　the　mission　of　universities　host　sporting　events　and　the　activities　is　becoming　more　difficult.　Large-scale　activities　hosted　in　universities　have　features　including　a　wide-ranging,　complex　factor,　multi-stage,　and　so　on.　Risk　is　everywhere.　Based　on　the　crisis　spread　theory　made　by　Steven　Fink,　the　paper　divides　the　risk　decision-making　system　into　four　phases　and　makes　the　risk　assessment　decision　using　a　comprehensive　method　of　decision　tree　analysis　and　Monte　Carlo　simulation.　Finally,　the　paper　makes　a　risk　decision-making　empirical　analysis　of　Beijing　University　of　Technology　hosted　large-scale　activities　of　C　in　the　venue.