The key to escape dangerous situations is determined by evacuation behaviors. Arenas allow great capacities but extreme difficulty in evacuation. However, the design and practical operation in evacuation mostly lack of empirical evaluation. To comprehend the evacuation behavior of all the participants and the differences between real leaving situation and designed value (SIMULEX), the study takes the advantage of the official evacuation drill and a full occupied opera (15,000 persons) required the arena operator through the questionnaire and video. The study observes that all the existed design, simulation, and evacuation management presents some difference with practical evacuation behavior, which without improvement will directly endanger the evacuation. As a result, the study, proposes improvement strategies and provides for the architect and operator for design and management as references.