Based on the policy documents public available,which have been issued and implemented by the CPC Central Committee,the State Council,relevant departments,and national legislative bodies,the paper uses the text mining methods including TextRank algorithm to quantitatively analyze the changes in the theme words of China's forestry policies in different periods.It is found that the theme words of"resource acquisition","ecological improvement"and"scientific research and education"in China's forestry policies have undergone significant changes;among the policy tools,the proportion of command-and-control tools has decreased while incentive tools have an increased proportion,which reflects the evolution of the core themes in different periods,as well as the transition logic of the policy concept from"government-led exploration"to"common governance by all people",the policy process from"beforehand control"to"the balance of beforehand control,process control and afterwards control"and policy tools from single to diversified in their development.
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