Bibliometrics is used to analyze the total amount of scientific publications in various countries and to draw the map of scientific knowledge. It can not only intuitively show the scientific research strength of these countries in POM-based photocatalysis but also analyze the tendency of scientific research cooperation between different countries. In the WoS database, each scientific publication belongs to several countries, depending on the author's country. It is worth noting that if a scientific publication contains author information from multiple countries, it will be repeated statistics.