1　Introduction

This section defines the core connotations of the ecological development outlook, reviews the policy evolution of China's ecological civilization construction from the 17th to the 19th National Congress of the Communist Party of China, examines the theoretical development of two ecological philosophies—"harmony" and "multidimensional harmony and interactive symbiosis"—in the field of ecolinguistics, summarizes domestic scholars' ecological discourse analysis practices in various types of discourse such as environmental advertisements and news reports, points out the deficiencies in current ecological discourse analysis of national policy documents, and ultimately clarifies that this study adopts "multidimensional harmony and interactive symbiosis" as the theoretical framework to conduct mining analysis of the English translation of the 14th Five-Year Plan, aiming to reveal the ecological development outlook in China's external policy communication.

2　Literature Review on Text Mining of National Environmental Policy Documents

This section reviews the current research status of text mining of national environmental policy documents, noting that ecological discourse analysis should combine corpus tools with computer technology to excavate lexical, grammatical, semantic, and discourse information. Existing studies mostly employ quantitative content analysis, quantitative policy text analysis, coupling coordination models, and other methods, examining dimensions such as basic policy information, subjects, themes, instruments, and objectives to reveal policy evolution patterns and characteristics. However, existing literature predominantly focuses on diachronic studies, lacking exploration of the development outlook for national long-term ecological civilization construction planning. This study intends to adopt "multidimensional harmony and interactive symbiosis" as the criterion for judgment, conducting text mining and discourse analysis from an ecological perspective to examine the English translation of the 14th Five-Year Plan and its ecological civilization construction section, explore the national ecological development outlook, and examine the international communication effectiveness of the document's ecological content and the role of translator quality in constructing national political and cultural image.

3　Research Methods

This section introduces the data preprocessing methods for the English translation of the 14th Five-Year Plan using natural language processing technologies based on Python third-party libraries such as SpaCy, and elaborates in detail on five text mining steps: using VOSviewer for visualized socio-semantic network analysis and topic mining; utilizing SpaCy to retrieve adjectives in the ecological section and calculate word frequencies; employing BertTokenizer and BertEmbedding for high-dimensional space vector modeling and three-dimensional semantic distribution visualization; applying SpaCy and VaderSentiment for sentiment quantitative analysis; and combining regular expressions to retrieve key adjective contexts to excavate the ecological development outlook.

4　Text Mining and Data Analysis

Using tools such as VOSviewer, Python, NLTK, BERT, and VaderSentiment, this study conducts multi-dimensional text mining and data analysis of the English translation of the 14th Five-Year Plan. Regarding socio-semantic network construction, after preprocessing including word deduplication, stop word removal, and stemming, the study employs clustering algorithms, co-occurrence analysis, and topic modeling to identify five thematic structures: modernization construction, ecological supervision, social management, diplomatic cooperation, and political construction. Among these, the association strength between "environmental protection" and "plan" in the ecological supervision theme is prominent, indicating the organic integration of ecological development with other themes, with the government as the primary actor dominating environmental protection and coordinated regional development. At the level of lexical mining in the ecological section, high-frequency verbs such as promote, strengthen, and improve reflect the nation's positive stance on environmental governance; content nouns such as water, energy, resource, river basin, and national park highlight the comprehensiveness of resource protection, ecosystem management, and climate response; while conceptual nouns such as system and mechanism emphasize the systematic and mechanistic orientation of ecological civilization construction. Regarding ecological evaluative adjectives, the study screened seven high-frequency words including ecological, environmental, and green, finding that ecological concentrates in the front portion of the text describing natural ecosystems, environmental distributes in the middle and rear portions referring to human living environments, and green densely appears in the latter half corresponding to the implementation of green development concepts, while key, national, comprehensive, and urban are evenly distributed reflecting the global and systematic nature of ecological governance. In three-dimensional space vector analysis, word vector visualization based on the BERT model presents a three-layer radiating structure: the core concept layer ecological-environmental-green forms an iron triangle, the ecological foundation layer encompasses macro-strategic elements such as ecosystems, biodiversity, and resource, and the specific branch layer includes governance practices of the "mountain-water-forest-field-lake-grass-sand life community" such as water area ecology, biodiversity conservation, and agricultural ecology. Sentiment analysis results show that among 75 sentences in the ecological section, positive sentiment accounts for 81.3%, while neutral and negative sentiments each account for 9.3%. The dominance of positive sentiment represents the ecological construction orientation of policy texts, negative sentiment mainly points to ecological environmental problem governance, and neutral sentiment concentrates on policy mechanism descriptions, collectively corroborating the ecological philosophy of "multidimensional harmony and interactive symbiosis."

5　Conclusion

This section explains how the state guides the public to form an ecological development concept of harmonious coexistence with nature through the 14th Five-Year Plan policy document, finds that the state adopts a predominantly positive ecological attitude, playing the roles of ecological measure promoter, strict corrector, and serious supervisor, and emphasizes that language researchers should pay attention to ecological tendencies in discourse while being vigilant against "nature-centered" inhumane tendencies, insisting on advocating harmonious coexistence between humans and nature on the premise of putting people first.