Abstract: Meta analysis is a statistical analysis method for comprehensive analysis of single research results with the purpose of synthesizing existing findings. The application of Meta analysis method to forestry plays an important role in the research and analysis of relevant research achievements of forestry. Therefore, based on the collection and reading of relevant literature and books, this paper had a certain understanding of Meta analysis. It also summarized the basic concepts, advantages and disadvantages, specific application methods and applications of Meta analysis. It was found that Meta analysis was mostly used in forest resource evaluation, especially in the evaluation of forest ecosystem service value in forestry. Attention should be paid to avoid the limitations of meta-analysis methods and make up for the deficiencies of other estimation models, which can protect forest ecosystem, safeguard the economic interests of forest farmers and improve the forest ecological compensation system.