Abstract: Geological studies indicate that humic acids exsit in the total process of bauxite mineraliza-lion. In order to clarify the action of humic acids in the bauxite mineralization,in this paper in-lite clay rocks and aluminoferric rock are regarded as samples of mother rock of mineralization and red bauxixe respectively. Dissolution of Al₂0₃,SiO₂ and Fe₂0₃ in the above rocks in the hu-mic acid-CO₂一H₂O systems of different conditions is studied experimentally. Significance of humic acid in the processes of desilication and deferridization forming red bauxite from mineral-izing mother rocks in the superfical oxidizing environment,and that of deferridization and de-silication forming white bauxite from red bauxite in swamp reducing environment are illustrat-silication forming white bauxite from red bauxite in swamp reducing environment are illustrat-ed. Importance of humic acids in mineralising gelatinous bausite is disscussed.