Objective:To investigate and explore the factors leading to online game addiction.Methods:Questionnaires composed of demographic information,online game addiction instrument,flow experience instrument,loneliness instrument and depression instrument were used to assess 270 university and college students.Results:①Along with different degrees of online game addiction,there was significant difference among players of different flow experiences.②Relative lonely or depressive players were easier to become addicts than non-lonely or non-depressive players on the similar of condition flow experience and repetition.③Online game addictions had linear correlation with activity repetition,flow experience and loneliness.Conclusion:Factors of leading to online game addiction include activity repetition,flow experience and loneliness of players.