1, with different meanings: China Mathematical Star is a mathematical competition sponsored by China Mathematical Education Association in China, aiming at stimulating students' interest in learning mathematics and improving their mathematical literacy. China Cup Mathematics Competition is a mathematics competition sponsored by chinese mathematical society, and it is one of the most authoritative mathematics competitions in China.

2. Different needs: The China Digital Star Competition covers three stages: primary school, junior high school and senior high school, with different difficulties. China Cup aims to meet the needs of students at different levels. The competition covers three stages: primary school, junior high school and senior high school, with different difficulty levels, aiming at meeting the needs of students at different levels.