Abstract: The objective of this research is to investigate and explore the relationship between depression of network game players, and the characteristics of online games and the playing times. The investigation is carried out by using questionnaires. In a questionnaire, it contains questions about demographic information, characteristics of online games, and depression instrument. Questionnaires are sent to 160 college students in Beijing and 100 valid ones are returned. By analysis, it is strongly shown that the players depression has linear relationship with six dimensions of online games characteristics. They are friendship, team work, background stories, levels, rewards, and roles. Among them, rewards, levels, and team work contribute more than the others to depression. It also shows that depression has linear relationship with activity repetition.