The composite medicine of the present invention contains tasmanian bluegum oil with alpha-pinene and 1,8-cineole as main components, medicinal diluent and medicinal additives. It may be administrated in solid form, semi-solid form or liquid form, and its preparation may be taken orally, intravenous injected or locally administrated. It is used in treating diseases of respiratory system, such as upper respiratory tract infection, acute and chronic bronchitis, chronic obstructive pneumonia, pulmonary tuberculosis, pneumosilicosis, etc.