The current situation of polystyrene supply and demand worldwide is summarized. It is pointed out that the operating rate of polystyrene units is only about 76% because the production capacity exceeds the consumption demand in the world. 综述了当前世界聚苯乙烯(PS)市场的供需现状,指出目前全球生产能力大于消费需求量,致使开工率仅76%左右。