Abstract: Media education plays a significant role in new media era.An action research was carried out in college English course to explore the methods and effectiveness of media literacy education based on multiliteracies theory.In the study,multiple sources of data were collected and quantitative as well as qualitative analyses were conducted.In terms of effectiveness,data analyses showed that media literacy education based on multiliteracies theory could improve students'ability of media analysis,media evaluation and media production.Besides,it could raise students'awareness of cultural diversity and improve their sensitivity to genre.However,it was also found that students'ability of media analysis and media production could be improved in aspects such as forming logical,in-depth interpretations and achieving proper balances between appropriateness and creativeness.