Recent studies indicate that employees are more likely to take organizational citizenship behavior (OCB) as in-role rather than extra-role. A survey of 349 participants from Chinese enterprises demonstrated that the older the employees are, the more OCB they will perceive as in-role, and the higher the position one holds in the organization, the higher OCB in-role ratings he or she counts. Women employees tended to show higher in-role perception than men on some OCB dimensions. The results of the study suggest that the employees’ age, position and to some extent gender are important antecedents of organizational citizenship behavior as in-role orientation.