He started gymnastics at age three; he was a weak child, and his parents wanted his strength to improve.

In May 2017, Sun competed at the Asian Championships in Bangkok, Thailand, where his team won gold.

[2] In August, Sun competed at the Asian Games in Indonesia, where his team won first.

[6] Sun competed at the World Championships in Stuttgart, Germany, where his team placed second.

[2] At the 2020 Summer Olympics in Tokyo, Japan, Sun competed for the People's Republic of China, a team including Sun Wei, Zou Jingyuan, Xiao Ruoteng, and Lin Chaopan.