The experimental model of middle cerebral artery embolism in rats was made by inserting nylon thread. It was discovered that Astragalus membranaceus decoction(both 4.26 g.kg-1 and 7.1 g.kg-1) could reduce the capillary hyperpermeability and alleviate the dyskinesia caused by cerebral ischemia in rats. Purified Hedysarum polybotrys decoction (waste substances removed with alcohol after decocting with water) (12.5 g.kg-1) could reduce the water content in brain caused by occlusion of bilateral carotids in rats. Purified Hedysarum polybotrys decoction showed a tendency to reduce the water content in brain, but without statistical significance.