Thirty people. The senior mathematics league refers to the national high school mathematics league. 198 1 year, at the first national conference on the popularization of mathematics held in Dalian, it was decided to take mathematics competition as a regular work of mathematical associations in chinese mathematical society and all provinces, municipalities and autonomous regions. According to relevant information, the number of provincial teams shall not exceed 30, and the national senior high school mathematics joint competition will be held on the second Sunday of September every year.