Abstract:In experimental study,the MID models were established with male Sistar rats induced by injecting paraffin liquid in left ventricle.The Step-through-water-maze test showed significant deficient of learn and memory function in model group.The results showed significant improvement of the MID model rats' ability of learn and memory,the SOD level of blood,cerebral issues and the index of Hemarrheology and MFU(P<0.05),but decrease of the MAD level of blood and cerebral issues in Kangnaoling Capsule group.