The present invention relates to a method for preventing, treating, and ameliorating a fatty liver disease in a person which may be a non-alcoholic liver disease or an alcoholic liver disease in the person. The method comprises administering to the person a therapeutic composition which is a pharmaceutical composition, a dietary supplement, a health functional food composition, and any combination thereof, wherein the therapeutic composition comprises an active ingredient which comprises a mixture of pharmaceutically acceptable solvent extracts of Hawthorn fruits and Salvia miltiorrhiza roots, and using the therapeutic composition administered to the person for preventing the fatty liver disease in the person. The ratio of the mixture of the solvent extracts of the Hawthorn fruits and the Salvia miltiorrhiza roots is selected over a range of ratios of between about 0.02 to about 50.
