PURPOSE: A method for producing a functional food made from the extract of Platycodon grandiflorum with various kinds of herbs and food additives is provided. This healthful food can promote immune activity of human body and so treat bronchial diseases. CONSTITUTION: The method includes the following steps of: (i) mixing Platycodon grandiflorum with at least one or more of herbs chosen among Trichosanthes kirilowii MAXIM., arrowroot, Liriopis tuber, Angelica gigas Nakai, ginger, Schizandra chinesis BAILL., Citrus aurantium L., Citrus unshiu MARKOVICH., Prunus armeniaca l., Lonicera japonica THUNB., Perilla frutescens var., Astragalus membranaceus Bunge, Mentha arvensis L., Coicis Semen and Adenophora triphylla var.; (ii) heating the mixture in water at 100deg.C for 2hr or shaking in an organic solvent for 3days to get the extract; (iii) adding 0.01-55wt% of food additive such as herb juice, vitamin, amino acid, flavoring agent, sweetening agent, acidulant, stabilizer, preservative, salt, mineral or nutrition
