In the precise governance of poverty, the legitimacy for policy innovation of rural anti-poverty is worthy of attention. By means of summarizing and extracting the literatures, we establish the framework for evaluating legitimacy in rural policy innovation. Taking filing Riser of poverty alleviation as an example, It is transformed into a framework for evaluating legitimacy of rural anti-poverty by grounded theory, and then its dimension and structure are further clarified. After that, conducting exploratory factor analysis and confirmatory factor analysis on sample data, and then testing its reliability and validity. Finally, a reliable scale is obtained, including 2 second-order factors and 8 first-order factors. This paper provides new perspective and inspiration for “gravity down” of governance in the new era.