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Occupant evacuation is currently becoming a challenging research direction in the field of emergency management. Approach to evacuation modeling is firstly proposed in the paper, which is mainly consisted of four core components, like spatial model, crowd movement model, individual behavioral model and psychological model. Secondly, the related solutions and development about these models in the recent studies are reviewed. The establishment of general process of evacuation modeling is then presented in the paper. Some existing issues and future directions are finally discussed. [ABSTRACT FROM AUTHOR]