In 2013, Duan was selected to participate in the China U-16 national team to play in the 2014 AFC U-16 Championship.
[1] Duan Liuyu would graduate from Cuiyuan High School (翠园中学高中部) in Luohu District, Shenzhen in 2015.
[2] On 19 January 2015, Duan Liuyu joined Shandong Taishan as a youth player for a record transfer fee of 1 million RMB, at the time the highest ever paid to a Chinese youth player.
[4] On 15 July 2018, Shandong Taishan announced that they had promoted Duan Liuyu to the first team's roaster.
[6] After making his debut Duan Liuyu would immediately establish himself into the team and scored his first goal in the Chinese Super League in a 3–2 defeat against Henan Jianye on 12 July 2019.