Abstract: The Mere Exposure Effect (MEE) means the mere exposure of stimulus can arouse positive evaluation. The concept of MEE was firstly defined by Zajonc in 1968. After that, a growing number of researches have been conducted to address this field. This paper introduces the definition of MEE, the studies on the influencing factors, the relationship between the stimulus exposure and affective evaluation, and the theories about MEE. Some problems in the current theoretic research are also discussed

Key words: Mere Exposure Effect (MEE), frequency, affective response