Abstract: The study shows that there are eight kinds of phenolic compounds in the concentrated apple juice such as chlorogenic acid occupies an important place in these materials. The influence of the technological process for clarifying is different among the ultrafiltration claritication,diatomite clarification and gelatin-enzyme-silicon solution clarificatiom The reduce of the phenolic compounds clarified by the ultrafiltration is maximum.

Key words:  , Phenolic compounds Clarification； Ultrafiltration； Concentrated apple juice；