Liu Xianyin, director and publishing expert of China Forest Ecological Culture Publishing Research Center, summarized four specific sources of topic selection: 1. Problems that society needs to solve. 2. The contradiction between theory and practice. 3. Contradictions in theory. 4. Practice internal contradictions. Specifically, it can be divided into two aspects:
(1) Leading: Solving the urgent needs of social practice. This is the direct source. For example, The Charm of Ancient Trees in Beijing is a special gift for the 29th Beijing Green Olympics.
(2) Summary: By consulting the literature, we can understand the latest achievements in the research field and the development trends and frontiers of related disciplines. This is an indirect source. By consulting a large number of documents, that is, deriving, extending and sublimating from the theoretical summary of predecessors, we can select topics with high value that can enrich, improve and even fill the gaps. For example, the publishing project of China Forest Ecological Network System Engineering Construction Series is the integration of a series of research results such as China Forest Ecological Network System Engineering Construction. According to the requirements of the publication of national fine books, the construction of national fine books will provide scientific theory and practice for the construction of ecological civilization.