[Purpose/Significance] This study proposes a methodology and process for knowledge discovery in technology fields based on the integration perspective. By constructing a knowledge map of multi-energy technology and focusing on analyzing the integration features (e.g., synergistic energy utilization and system integration), this study aims to provide a new methodological tool for identifying the potential of technology integration. [Method/Process] By integrating different patent technology classification systems, this study innovatively constructed a multi-energy integration patent knowledge graph. It established a domain knowledge organization framework based on multi-technology classification fusion. The conceptual model was constructed by combining the "top-down" and "bottom-up" methods, with the low-carbon energy technology field using as the empirical research object to systematically analyze the multi-energy fusion trend, fusion signal, and multi-energy fusion potential of low-carbon energy. [Result/Conclusion] Empirical study shows that combination of knowledge map, and bibliometrics can help analyze the development trends of low-carbon energy convergence, reveal the characteristics of technology integration of multiple low-carbon energy sources, and focus on specific domains to explore the potential and technological evolution path, to provide a decision-making basis for the development and application of low-carbon multi-energy integration technology.