Abstract: Technology life cycle assessment (TLCA) can provide methodological support for technological improvement, scientific decision-making and carbon neutrality. CiteSpace software was used to study the research characteristics, changing trends, key areas and evolution paths of TLCA and its research progresses in the field of carbon neutralization in recent 20 years. The results showed that the number of published literature related to TLCA was rising, and had entered a rapid development stage since 2006. The papers mainly focused on Engineering, Ecology, Environmental Science, Engineering Environmental, Science & Technology: Other Topics, Energy & Fuels, Green & Sustainable Science & Technology. The research object, evaluation method and application of TLCA were research hotspots in recent years. The energy production technology, carbon footprints and waste treatment technology were the research focus of TLCA. System, model, framework, uncertainty and other aspects were the key points to improve the evaluation method. Applicability development and comprehensive evaluation of methods became the follow-up development direction. Improving the effectiveness of sustainability, efficiency and decision support was the breakthrough to improve the application of TLCA. Carbon footprint LCA could be used to guide the realization and path selection of technology carbon neutralization goals. The combination of LCA system and other assessment methods was becoming a trend, which could improve the accuracy and effectiveness of comprehensive assessment of technology and provide an effective reference for achieving the goal of carbon neutrality.