Studying the evolution of industrial policy has significant theoretical and practical implications. Given the high uncertainty of emerging industries, this paper studies the evolution of policies in the new-generation information technology industry based on tentative governance theory. To begin with, we construct an analysis framework composed of six policy elements: governance niche, governance scope, governance process, governance goal, governance time, and governance subject. Subsequently, we encode and measure the tentative degree of policy texts in the new-generation of information technology industry that released between 2011 and 2019. The results are as follows: 1) for the evolution of single policy element, the tentative degree of governance niche and governance subject declined steadily, and the governance process and governance goal rises firstly and then decreases, and the governance time and governance scope drop down firstly, increase followed by, fall finally；2) for the overall evolution of policy, the tentative degree witnesses a tendency of “low level - high level - middle level”, and it can be divided into three stages: initial stage, expansion stage, and equilibrium stage.