Abstract: Flow is a kind of important positive emotions, and it is emotional experience which occurs when one shows eager interest in a particular activity or thing, making him/her act in total involvement. Flow experience includes nine characteristics which are balance of perceived challenge and skills, the merger of action and awareness, clear goals, unambiguous and immediate feedback, concentration on the task at hand , a sense of control over the outcome of the activity, lack of self-consciousness, transformation of time and autotelic experience. Psychological researches on flow have mainly focused on its own nature and its applications by interview, questionnaire and ESM

Key words: Flow, psychological mechanism, channel models, ESM