[5] At the 2010 World Championships, Sui won a bronze medal with team China and finished 5th in the floor exercise final.

Sui won the gold on balance beam after a performance that left her with a margin of more than 0.5 points over the silver medalist, teammate Yao Jinnan.

She immediately followed it with a strong performance in the floor final, winning the silver medal with a score of 15.066, behind Russian gymnast Ksenia Afanasyeva.

Sui revealed in a subsequent interview that she considered retiring after being left off the Olympics Team in 2008, but that these 4 years of hard work had been worth it, and that she was glad she persisted after encouragement from her coaches.

She additionally qualified in first place to the balance beam event final (15.4), where she finished with the silver medal (15.5) behind gold medalist and teammate Deng Linlin.