Over the last twenty years, there has been a surge in research on happy emotions, with Foreign Language Enjoyment (FLE) emerging as a popular area of study. By means of several studies, it has been found that FLE is closely related to foreign language (FL) learning (motivation, commitment, and FLE). This paper mainly focuses on FLE in foreign language learning. Concluding from the literature foreign language enjoyment can positively and significantly predict FLE, which is impacted in the process of altering FLE by several outside as well as inside factors. In addition, the paper concludes that, on the one hand, FLE can act as a mediator with other foreign language emotions to affect FLE. On the other hand, FLE is moderated by mediating factors in the way it affects FLE. In contrast, this paper concludes that most of the researches on foreign language emotions has been conducted in terms of the relationship between internal and external variables of individuals, but it lacks the examination of the environmental dimensions and learning environments. It is hoped that future research can explore English achievement (e.g. listening, reading, writing) in more details. Simultaneously integrating language teaching methodology and information technology to investigate the new learning styles on FLE and their impact on academic English learning.