The pollutants concentration distribution of car park of leaving floor of Nanjing South Station was discussed under different ventilation conditions.It was found that the velocity field and concentration field was very uneven under natural ventilation,and the pollutants concentration in the occupied zone was not conform to the requirement of relevant standards.By using of mechanical ventilation and inducing fan,the air quality of the car park could meet the requirement.%以南京南站出站层停车场为研究对象,对不同工况下停车场内的污染物浓度分布进行研究。结果表明,单独采用自然通风,该区域的风场和污染物浓度场分布极不均匀,人员活动区域污染物的浓度达不到标准要求;采用机械通风方案（大排风量）,并结合局部采用诱导风机的通风方案,能够保证所有部位污染物浓度均满足空气质量要求。
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