The changes of the contents of 6-keto-PGF/α and TXB 2 in cultured fluid in different phases and the effects of Yiqihuoxue decoction were observed after the action of TNF upon HYEC. The results showed that 8 hours after the action, 6-keto-PGF/α was increased significantly, TXB 2 and the value of T/K were reduced significantly(P