Based on the data of Shanghai and Shenzhen A-share listed companies from 2015 to 2019, this paper empirically tests the impact of tax incentives on the establishment of R&D posts and the moderating role of R&D expenditure in this process. The results show that: tax incentives have a significant positive effect on R&D post setting, that is, tax incentives can stimulate enterprises to increase R&D posts and absorb more scientific research personnel; secondly, in the process of tax incentives on R&D post setting, R&D expenditure can positively adjust tax incentives and promote enterprises to further expand R&D posts. Previous literatures pay more attention to the stimulating effect of tax incentives on R&D material investment of enterprises, but seldom evaluate the policy effect from the perspective of human resources. This paper empirically analyzes the impact of tax incentives on the establishment of R&D posts, which can supplement the existing literature in human resources research to a certain extent, and provide a new perspective for the evaluation of tax policies.