In the first month of 50/kloc-0 BC, Kang Wang began to call Guo Xiang. At this time, Xiao Yan was appointed as the general of Zhengdong, and Xiao Yan personally marched from Xiangyang to Jiankang with a great army. Xiao Yan left his younger brother Xiaowei in Yongzhou as the secretariat of Yongzhou. At that time, Yongzhou's troops and warehouses were empty, and the satrap of other cities refused to obey Xiao Yan's order to attack Xiangyang.
Because the local satrap didn't listen to Xiao Yan's orders, Xiao Yan couldn't attack. At this time, Xiao Wei and Cheng Xiao sent troops to fight back and captured the enemy in one fell swoop. At this time, Yongzhou, which was originally in crisis, returned to calm. Just as they surrounded Jiankang, Jingzhou was in danger. At that time, Lu Xiu, the satrap of Badong, attacked Jiangling, and Xiao Wei randomly led Yongzhou military forces to rescue Jiangling. Xiao Wei made a great contribution in this campaign, and together with Emperor Xiao Baorong, he was named a bachelor of Zhenbei University.
In the first year of Jian 'an, Xiao Wei was once again named King Jian 'an. Sixteen years later, due to the barren land in Jian 'an, Liang Wudi changed the original Jian 'an King Xiaowei to Nanping County King. Later, Xiao Wei served as the secretariat of Xuzhou and Jiangzhou. Later, he returned to Beijing because of his old age and illness, and served as Fu, Zhongshu and Guanglu. But after returning to Beijing, Xiao Wei believed in Buddhism.
In his later years, Xiao Wei was superstitious about his serious illness. When he attacked Jiankang, he destroyed some Buddha statues in Xiangyang Temple because of military expenses. Xiao Wei ordered people to kill them. It is said that Xiao Wei became a nightmare because of this incident, and his illness became worse and worse. People began to be superstitious and began to worship Buddha.