This study, beginning with crowding situation caused by staff stranding in gymnasium, introduces theoretic basis of relative accidents, definite basic parameters including crowd flow rate, group flow and marginal sizes of evacuation channel, walking velocity of groups with different densities and predictive velocities of evacuation in different regions. Deduce and build stranded crow number quantitative model. By analyzing cases, calculate specific route and time of a Chinese university's multifunctional gymnasium in travel time method. Find evacuation bottle neck probably exist. Calculate specific stranding situation according to such model, find potential safety hazard and provides advice for improving stands exits. It can provide evaluation standards and references for designing, managing and transformation. It can also choose evacuation routes and make emergency plan.
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