This thesis investigates the impact of coworker exchange relationship, job satisfaction by testing how these variables could foster greater knowledge sharing intention and behavior as well as implementing expectation theory and social exchange theory in order to utilize the influencing power among the variables to enhance the organization’s cohesiveness, increasing performance then manage the human resources more effective to achieve the organization’s goal. This study tests the mediating role of job satisfaction among three interpersonal variables and knowledge sharing. By operating structural equation modeling (SEM), the results of a field investigation of 401 subjects from financial industry shows that job satisfaction mediated the positive relations of coworker exchange to knowledge sharing. On the other hand, outside job satisfaction have stronger relations to knowledge sharing behavior.