Recently, the supercritical fluids technologies have been paid extremely increasing attention in the country. From now on, the supercritical technologies such as extraction/purification, SCORR (supercritical carbon dioxide photo-resist removal), DDS (drug delivery system), formation of functional structure of polymer or ceramic materials, preparation of metal oxide nano-particles, construction of database (DB), etc., will be investigated and developed more actively. The study on the supercritical emulsion among supercritical fluid technologies has been performed rigorously in advanced countries by recognizing its importance, however, a few researches are on progress in the country. The purpose of researching supercritical emulsion is mainly focused on the non-polar supercritical carbon dioxide and enhancing its application with polar substances. In this article, we are aimed to promote the research foundation of supercritical emulsion by reviewing in detail the supercritical CO₂-macro/microemulsion and by introducing preponderantly the researches about its application.