The level of service in public walking spaces is mainly determined by the differences in pedestrian traffic demand and infrastructure supply. A problem worth studying is the evacuation process in a closed square which has a partition wall. In this paper，a cellular automaton model is presented to simulate the evacuation process in the square. This model defines a floor field and considers the effect of “ excess of politeness”. Both the evacuation time and the statistical characteristics of pedestrian flux time seriesare regarded as the indicators of the evacuation progress and the measure of evacuation efficiency. Concerning the two indicators，some viewpoints on the evacuation design of the partition wall are put forward: changing the length of the partition wall could reduce the evacuation time，but meanwhile it could also bring about the non-stationary pedestrian flux；at a premise of prior consideration for evacuation time，the length of the partition wall should be better chosen to make the pedestrian flux distribution more homogeneous and to make the pedestrian flux time series more stationary.
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