Xu Jiaqi was a member of SNH48's Team SII as well as its international sub-unit 7senses. She is born in Taizhou, Zhejiang, China in the year 1995. She has 7 years of experience in ballet and is also known for her supporting role in the historical drama "Legend of Yunxi," playing Chu Qingge. She is a rapper, dancer, and singer.

In 2020, she joined iQiyi's survival show "Youth with You" and finished in 3rd place with 9,086,752 votes.

On May 30, 2020, she debuted with the final debut line of Youth With You girl group "THE9."

Her fandom name is "Blackis" and is under Shanghai Star 48 Culture Media.

She graduated from SNH48 Team SII on October 14, 2020.