The main math competitions in China and their organizers are as follows:
"National Primary School Mathematics Olympics" (chinese mathematical society Popularization Committee)
National "Hope Cup" Mathematics Invitational Tournament for Primary and Secondary Schools (Popularization Department of China Association for Science and Technology, China Optimization Method and Economic Mathematics Research Association, China Laboratory, Mathematical World Magazine, Zhongqing Online Website)
"I Love Mathematics" Summer Camp for Primary School Students —— Finals of "National Mathematical Olympiad for Primary School Students" (Popularization Committee of Chinese Mathematical Society)
National "Huajin Cup" Junior Mathematics Invitational Tournament-Primary School (hosted by China Children's Press and Publication General Agency, China Optimization Law and Economic Mathematics Research Association, CCTV Youth Center, China Laboratory, China International Science Exchange Foundation, etc.)
"National Junior High School Mathematics League" (chinese mathematical society Popularization Committee) has been cancelled in Jinan and other regions.
"National Junior Middle School Mathematics Competition" (China Education Association Middle School Mathematics Teaching Professional Committee)
"I Love Mathematics" Summer Camp in Junior High School —— Finals of "National Junior High School Mathematics League" (Popularization Committee of Chinese Mathematical Society)
National "Huajin Cup" Junior Mathematics Invitational Tournament-Junior High School (hosted by China Children's Press and Publication General Agency, China Optimization Law and Economic Mathematics Research Association, CCTV Youth Center, China Laboratory, China International Science Exchange Foundation, etc.)
"Wuyang Cup" Junior High School Mathematics Competition (Journal of Middle School Mathematics Research)
"National Senior High School Mathematics League" (chinese mathematical society Promotion Committee)
China Mathematical Olympics-Winter Camp (chinese mathematical society Promotion Committee, chinese mathematical society Olympic Committee)
Chinese Women's Mathematical Olympics (chinese mathematical society Olympic Committee)
Western China Mathematical Olympics (chinese mathematical society Olympic Committee)
Southeast Mathematical Olympiad (chinese mathematical society Olympic Committee, Fujian-Zhejiang-Jiangxi Mathematical Olympiad Cooperation Group)
Northern Mathematical Olympiad Invitational Tournament (chinese mathematical society Olympic Committee)
National Mathematics Competition for College Students (chinese mathematical society Promotion Committee)