A total of 1382 related publications come from 55 countries, and there are significant differences in the number of publications issued by countries. Figure represents a network of cooperation between different countries. Each node represents a country. The larger the node is, the greater the number of submissions is. A curve connects the nodes, and the thickness of the curve represents the closeness of the cooperation between countries. Obviously, China, the United States, Iran, Japan, France and Greece have close cooperative relations. These countries play a link role in POM-based materials in photocatalysis. Countries from Europe, America and Asia have robust research strength in POM-based photocatalysis, most of which are developed countries. From Table , China ranks first in the world with 953 scientific publications, accounting for 68.96 per cent. Iran ranks second with 100 articles, accounting for 7.2 per cent, a considerable difference from China. In the top 10 countries, although Germany, the United States and Italy don't have an advantage in terms of the number of publications, the AC of these three countries is higher, especially in Germany (AC=134.33). In fact, many chemists from Europe have made outstanding contributions to the field of POM chemistry in history. In 1826, Berzerius added the ammonium molybdate solution into phosphoric acid to synthesize the first POM. C. Marignac synthesized Tungstosilicic acid in 1864, and its composition was investigated by chemical analysis. After nearly 200 years of development, POM chemistry has become an important part of inorganic chemistry. Scientists from France, the United States, Japan and other countries have conducted in-depth work on POMs. With the development of characterization techniques such as X-ray crystallography, electron paramagnetic resonance spectroscopy and nuclear magnetic spectroscopy, researchers in POM-based materials research have been worldwide. Many countries hope to use photocatalysis to achieve energy transformation and reduce the proportion of fossil energy. This has also stimulated interest in POM-based photocatalysis, especially in countries with a strong research foundation in photocatalysis.