The invention discloses a new purpose of a compound Chinese Lobelia formulation for treating tumor or treating tumor in conjunction with chemotherapeutic treatment and radiation treatment, which belongs to the field of traditional Chinese medicine. Aiming at various injuries such as universal and serious damage to immunity of the organism, obvious reduction of white blood cells, bacterial infection, pain, and the like caused by simulative chemotherapeutic treatment and radiation treatment to a patient who suffers from tumor, experimental results indicate that the compound Chinese Lobelia formulation can obviously enhance the immunologic function, can remarkably increase the phagocytic function of scavenger cells, has protective action for reducing white blood cells, and has the weighting function for spleen and thymus; the compound Chinese Lobelia formulation has a certain in-vitro antibacterial action for staphylococcus aureus (G+) and colon bacillus (G-), has obvious protective function for a mouse infected by staphylococcus aureus and colon bacillus, can obviously reduce the death rate of the infected mouse and delay the death time to some extent; and the compound Chinese Lobelia formulation has obvious analgestic action for rats and mousse. The experimental results explain that the compound Chinese Lobelia formulation can be used for treating tumor or used for treating tumor in conjunction with chemotherapeutic treatment and radiation treatment and can increase the tolerance and the adaptability of a patient for chemotherapeutic treatment, strengthen the immunity of an organism, shorten the period of chemotherapeutic treatment or radiation treatment, reduce the toxic side reaction in chemotherapeutic treatment or radiation treatment, lower the death rate of a tumor patient and improve the life quality of a patient.