Abstract:The Siwei Shaoyao Decoction possesses a marked effecicaused by penicillin G potassium injection. As shown from the hot-plate test ,it also has an obvious analgesic effect onmice. To some extent , the decoction has a significant anti-inflammatory effect on the acute edema in hind Paws of ratsand the effect is believed to be related to the reduction of capillary permeability.