Abstract: Green governance in the construction of ecological civilization of China has the legitimacy, necessity and possibility of becoming a reality. Content analysis and critical discourse analysis were used to review green governance policy texts since the reform and opening up. It is found that green governance policy in China has experienced a more tortuous transformation process. From the perspective of value orientation, green governance policy has experienced the change from "giving priority to efficiency" to "giving due consideration to efficiency and fairness" and then to "give priority to fairness". From the perspective of time series, green governance policy in China can be divided into three stages:1978-2002,2003-2011,and 2012-2016. In terms of the content of the policy, China's green governance policy has presented content changes from "light green" of environmental protection, to"deep green" of environmental(ecological)governance, and then to "pan-green" of ecological civilization construction. At the same time, the green governance policy in our country presents the dual loss of value rationality and technology rationality. Only by constantly promoting democratization, legalization and harmonization of green governance policy will ecological civilization construction finally have a solid system foundation.