Echinacea purpurea, a kind of Echinacea which belongs to Chrysanthemum family, is planted in America originally and takes possiession of high medicinal value. The extract from its root, stem and leaves is yellowish powder. the clinical experiments have proved that Its compound effect can strengthen the immunity, especially, at the early stage of catching cold or influenza. It plays wonderful effects on the patients. It can strengthen the immunity and shorten the fit of the respiratory infection, relieving headache and nose inflammation. The singular prescription can strengthen the immunity within the human boby, resisting against the viral attack.