When we use MathSciNet, a comprehensive bibliographic database for mathematical sciences, we can find a number of mathematical journals published in Japan. However, it is uncertain how many different titles of mathematical journals are published and how many articles appeared in them. For example, about 10 titles of major mathematical journals, which are supported by SPARC Japan, IR of Kyoto University Library, and IR of the University of Tokyo Library, account for approximately 5 to 10 percent of articles in certain research fields in the world based on mathematics subject classification. Figures in the poster show the detail. Furthermore, Japanese mathematician has made a major contribution in those research fields. Also, we can note that the number of articles published in Japan is not far behind the number published by Springer and Elsevier. From these facts, it is clear that SPARC Japan and institutional repositories play an important role for mathematical publications in the world. These major journals contain about 1000 articles each. However, according to MathSciNet, there are over 100 titles of mathematical journals and university bulletins containing less than 200 articles each. Including these titles, contributions of Japanese mathematical publication to the world will achieve more recognition. From this viewpoint it is important to recognize institutional repositories as a platform of university bulletins and academic journals in Japan. In the poster the author would like to show the results of our analysis and the future plan in detail.