With global economy being integrated

organization is confronting competition

which requires employees in organization work in a spontaneous

active

proactive manner.Therefore it is a new direction in studying organizational management to understand motivating factors of organizational citizenship behavior（OCB） and exploring measures to motivate exhibition of OCB by employees effectively.From two perspectives of social psychology and organizational behavior

the main literatures on the study of OCB are reviewed.Furthermore

significant movitating variables whicl influence OCB are recognized and classified

which include individual and situational variables.At last

the limitations of existing studies are analyzed and the further research trends are suggested.