Abstract: Based on the policy quantitative scoring method and social network analysis method, this paper quantitatively studies 219 environmental regulatory policies in the scientific and technological (S&T) fields formulated in China from 1978 to 2016 in the dimensions of policy attributes, policy objectives, policy instruments, and inter-department cooperation network, and then effectively combs the evolutionary logic of policy changes and inter-governmental cooperation. This paper shows that there are varying degrees of changes in the number of environmental regulation policies in S&T field, the coordination of policy departments, and the policy contents such as policy objectives and policy instruments. The evolution logic of the environmental regulation policies in S&T fields is mainly manifested in four aspects, which are the continuous improvement of the policy mechanism, the short-term emergency effects of the promulgation policy, the long-term superposition effect of the cumulative policy, and continuous strengthening of inter-department cooperation. Finally, this paper proposes related policy recommendations from the perspective of systematic top-level design, improvement of policy attributes, continuous optimization of policy objectives and policy instruments, and strengthening inter-governmental cooperation.