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Route choice is a fundamental requirement in the evacuation process.The aim of this paper is to identify a method to simulate crowds in large indoor spaces with consideration of the acoustic system.This paper first extends an existing cellular automaton model and proposes a cellular automaton crowd route choice model (CACR model) to simulate evacuees in large indoor spaces.It then defines a measure for evaluating the utility of evacuation time using the CACR model under different circumstances,such as a fire situation or different voice wing systems,which other commercial models cannot simulate.The analysis of the characteristics of a sound field in large indoor spaces is based on field measurements.An observation experiment in a gymnasium is employed to test the proposed model in a stadium evacuation scenario.The results demonstrate that the CACR model can accurately simulate the evacuation process in large indoor spaces under various circumstances.