In 1995 Xu won the World U14 Girls Chess Championship held in São Lourenço, Minas Gerais, Brazil.

[4] In October 1997 she won the World U16 Girls Chess Championship in Yerevan, and in 2000, also in Yerevan, she won the World Junior Girls U-20 Championship by a large margin – she began with seven consecutive wins and finished with a score of 11/13.

On July 11–21, 2003, Xu won the China Women's National Chess Championship (FIDE Zone 3.3 qualifier) held in Yongchuan District, Chongqing, with a final score of 6.5/9.

[5][6][7] In November 2003, Xu won the Chinese Women's Individual Chess Championship in Shan Wei with a final score of 8.5/11.

[11] Xu Yuanyuan's daughter, IM Lu Miaoyi, represented China at the 45th Chess Olympiad at the age of 14.