Study on the Evolution and Collaborative Network of Science and Technology Talents Policies:Based on Policy Text Analysis from 1978 to 2020
（1. Institutes of Science and Development, Chinese Academy of Sciences, Beijing 100190；2. School of Policy and Management, University of Chinese Academy of Sciences, Beijing 100049,China;3. Department of Public Management, Faculty of Humanities and Social Sciences, Dalian University of Technology, Dalian 116024,China）
