Abstract
The study examines the appearance of community to explain behavior of customer loyalty in on-line game. Commitment of community was resulted from the need which players participate in community, inveracity of numbers and circulation of community. Commitment has a pulling force for numbers and decreases floating numbers. The discussion between numbers will make customers increase behavior of repurchase.The survey send 250 questionnaires in Taipei, Tao Yuan and Sin Zhu, then SPSS10.0 is used to analysis data that gathered 234 questionnaires to test hypothesis. The result indicates that commitment; service quality and satisfaction have impact on customer loyalty. Among the needs of task and relationship of players play the main role in influencing the commitment of community, but community performance and coordination have no impact on commitment. It implies that commitment of community play an important role in on-line game.