Abstract:In order to explore the application status of soil acidification and improvement materials, based on the core collection of Web of Science and Wanfang patent database, journal papers from 1990 to 2019 were searched with "acid* soil*" or "soil acidi*", and the invention patents from 2010 to 2019 were searched with the subject word "acidification, acid soil conditioner, conditioner". In total 10 193 journal papers and 297 invention patents were retrieved respectively. Visual software such as VOSviewer, CiteSpace and HistCite were used to analyze the co-occurrence, co-citation and citation of keywords, journals, authors, institutions, countries and other fields. The results showed that more and more attentions have been paid to soil acidification and improvement materials, and further strengthening soil science is of great significance to the study of soil acidification and its improvement. The research field focused on the biochemical process of soil acidification, soil aluminum toxicity and their prevention, soil heavy metal activation and passivation, soil acidification and the application of improved materials. In the past 10 years, soil acidification improvement has mainly focused on traditional materials such as lime, agricultural wastes/by-products, industrial wastes/by-products and minerals. New materials such as biochar, natural polymers, humates and microbial agents have attracted more and more attentions. The high-yield countries such as the United States, China and Australia had close cooperation between each other, and the high-yield institutions such as the Chinese Academy of Sciences, the University of the Chinese Academy of Sciences and the University of Western Australia had close cooperation. The high-yield authors such as Baligar V C, Xu R K, Fageria N K had close cooperation. This study contributes a comprehensive understanding of the current situation and trend in the field of soil acidification and its amendments, as well as provides an important reference and basis for soil acidification regulation and sustainable development.