At present, the domestic and intern

At present, the domestic and international scholars have many research aspects aiming at the building fireevacuation. The main research aspects and ideas are followings [9]: (1) the personnel evacuation research based onthe motion law of subway fire smoke; (2) the study based on the effective alarm system and evacuation facilities toinfluence evacuation; (3) the research of the important role of information technology in guiding evacuation; (4) theresearch in the performance-based building design and evacuation plan. At present, the most effective and popularapproach is to create evacuation model for numerical simulation in the personnel evacuation study. It’s studied toprovide scientific basis for evacuation design and operational management. At home and abroad, a lot of researcheshave been done in this aspect, and some achievements have been obtained. EGRESS [10], EVCNET4 [11], EXTT89[12] and more than twenty kinds of computer-based evacuation models have been successively developed. Sime andothers [13] proposed a personnel reaction evacuation model (ORSET), which can analyze in detail the humanbehavior and its changes in fire. In the social force model [14] proposed by Helbing etc., the influence of paniccoefficient on evacuation was considered, however, the width effects of door or staircase on the evacuation timewere not considered. In the process of building fire evacuation, exits and staircases are usually the "bottleneck"positions. Nowadays, there are some studies aiming at the influence of exit width to evacuation [15-17], but the stairwidth in evacuation is rarely discussed. Therefore, this paper studied the influence of stair width in subway stationon personnel evacuation based on stairway level of service.