This study examined the relationship among the managerial trustworthy characteristics, supervisor's abilities, employees' trust and knowledge sharing behaviors. The authors investigate the managerial trustworthy characteristics as antecedents of employees' trust. And, the authors explore the relationship between employees' trust and knowledge sharing behaviors. Then, the authors demonstrate the mediating effect of employees' trust between managerial trustworthy characteristics and knowledge sharing behaviors. After that, we discuss supervisor's abilities impact on the relation between managerial trustworthy characteristics and employees' trust. Participates, 144 sample units (included one employee and one supervisor), are from banking industry and semiconductor industry in Taiwan. The results suggest that when employees are sure of managerial trustworthy, they exchanged core knowledge with their supervisors.