Based on the social identity theory, this paper investigates the influence of HRA on knowledge sharing and the mediating mechanism of organizational identification, explores the moderating effect of task interdependence at the same time. Based on the survey data of 602 employees, Mplus7.0 software was used to construct a structural equation model (SEM) for testing. The results show that Commitment-focused HRA promotes knowledge sharing, Control-focused HRA weakens knowledge sharing, and organizational identification mediates this process completely. Task interdependence strengthens the positive relationship between organizational identification and knowledge sharing. When the task interdependence is high, the positive impact of commitment HRA on knowledge sharing is strengthened and the negative impact of control HRA on knowledge sharing is weakened.