利用已构建的实验平台，进行了一系列的实际实验以研究IEEE802.1P 对交换式工业以太网实时性的影响，并对比之前所取得的理论研究成果，发现理论分析不足之处以进行完善。通过实验展示和分析了工业以太网应用IEEE 802.1P 技术可能出现的问题，这些主要是不同优先级别报文之间存在干扰。所进行的实验对用于过程控制工业以太网实时性的理论分析和实际改进有着具体的指导意义。关键词：工业以太网；实时性；IEEE802.1P Abstract: By means of test bed designed previously, several practical experiments are carried out to study IEEE 802.1P for real-time behavior of switched industrial Ethernet. Compare theexperimental results with theoretical analysis, find their deficiency and perfect them. Theexperiments have shown the potential problems due to interference between priority levels. The experiments would direct the theoretical analysis and practical improvement in industrial Ethernet for process controlKey words: Industrial Ethernet; Real-time behavior; IEEE 802.1P