Organizational justice has long been the focus of research in the field of organizational behavior. In general, organizational justice is the subjective evaluation and perception of employees towards allocation of resources, rewards and punishments, performance evaluation, decision-making process and the interaction with the supervisor. Many studies show that organizational justice has a significant impact on employee attitudes and behaviors. To be clear, the main objective of this study is to explore whether the organizational justice the employee perceived will affect employee’s job satisfaction and organizational citizenship behavior. This study takes the real workplace environment as the target, with the actual staff as the sample, using the small and medium-sized computer and computer parts sales companies in Nanjing, China as the subject. In this study, 48 companies were randomly selected through field visits, the test object being the staff engaged in sales business in 48 computer and computer parts sales companies. The results show that there is a positive relationship between organizational justice and organizational citizenship behavior, and that job satisfaction has partial mediating effect on the relationship between organizational justice and organizational citizenship behavior.