From the perspective of the interaction between supervisors and subordinates, we constructed a moderated mediation model to investigate the influence of supervisor developmental feedback on subordinates' knowledge sharing, and examined the mediating effect of organizational self-esteem and the moderating effect of person-organization fit. Via the statistical analysis of 417 pairing data collected in two times, the results show that: supervisor developmental feedback had a significantly positive influence on subordinates' organization-based self-esteem. The organizationbased self-esteem of subordinates also had a positive effect on their knowledge sharing, and partially mediated the influence of supervisor developmental feedback on their knowledge sharing. Personorganization fitness not only moderated the relationship between supervisor developmental feedback and organization-based self-esteem, but also moderated the mediating effect of organization-based self-esteem.