Abstract:Buqihuoxue formula (a decoction for reinforcing middle warmer and activating blood circulation) can extend the cough incubation period of mice,reduce their cough freguency,increase the amount of phenolred secreted by their trachea,inhibit the swelling of their auricle,raise phagocytic activity and index of monophocyte,promote the production of hemolysin antibody and increase the spleen weight,which has a better effect than Buqi formula (a decoction for reinforcing middle warmer) and Huoxue formula (a decoction for activating blood circulation).