Over the past twenty years, affect study in organizational behavior field has been a mainstream research topic. Considering the multiple facets and diverse functional mechanisms of affect, a systematic review of affect constructs and the mechanisms through which affect influences organizational outcomes will help researchers to get a holistic understanding of affect study in organizational behavior field. This paper firstly clarifies the definition of affect in organizational behavior field. Secondly, it reviews the empirical studies addressing affect and organizational outcomes in top journals during the past decades. Based on this, it then proposes that the functional mechanisms of affect in organizational behavior field can be summarized as tuning mechanism, social information mechanism and motivation/energy mechanism, and their function characteristics are reviewed respectively. Lastly, it elaborates the limitations of current research and indicates the directions in future research to provide implications for follow-up affect study in organizational behavior field.