When the intensity of precipitation would exceed the design rainfall of drainage system in urban area, some part of flooded water intruded into underground spaces such as underground shopping mall or parking lot. In this paper, the danger of flooding in a large-scale underground parking lot and the safety of evacuation from there are discussed. Flood simulations were made by using a 2D shallow flow model in a model of multilayer underground parking lot. And assessment of safety evacuation was conducted with a criterion of escaping from a submerged real-size car. It is concluded that a short delay of evacuating from inundated place brings a lot of danger to the users stayed on the lower basement. And its danger level also depends on age and gender of person.

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