In the past studies showed that if employees in the organization perform their organizational citizenship behavior (OCB), the service quality and consumer satisfaction will promote. Additionally, OCB is helpful for team interaction and promoting team efficiency. It is because employees will cooperate, help each other or work hard to maintain or push others¡¦ welfare and benefit in their organization. However, there are few studies about how OCB is affected by different employment status in public section, and there is little discussion about moderating variables that affect OCB and employment status. In the organization, employees are the most important assets, but are the most difficult factor to control. This study is aimed at analyzing in the Control Yuan how employees with different employment status will affect their willingness to perform OCB. Besides, the study tries to find if ¡§working reason¡¨ and ¡§turnover intention¡¨ of contracted employees will affect the performance of their OCB. The major findings of this study are as following: (1) Relative to formal employees, contracted employees are less faithful than formal employees. Additionally, the contracted employees with turnover intention are less en-teamed than formal employees. There is not significantly different between ¡§devotion¡¨, ¡§loyalty¡¨ and ¡§activity¡¨. (2) In moderating variables about working reasons, no matter that contracted employees get the job willingly or unwillingly, there is no significant difference in their performance of OCB. (3) In moderating variables about turnover intention, the OCB of contracted employee is affected by turnover intertion in ¡§en-team¡¨ and ¡§position-fulfill¡¨. However, there is no significant difference in ¡§devotion¡¨, ¡¨loyalty¡¨ and ¡§activity¡¨ between formal employees and contracted employees.