There are too many papers in general journals. Beike was once evaluated by Peking University Library and published a book "Catalogue of Core Journals of Peking University". Too many papers published in Practice and Cognition of Mathematics will lead to being kicked out of the Catalogue of Peking University Core Journals by Beijing University. Practice and Understanding of Mathematics was founded in 197 1, which is an academic journal sponsored by the Institute of Mathematics and System Science of China Academy of Sciences.