His fierce rivalry with his cousin, Ashina Mishe, was instrumental in driving the Western Turks away from the Tang and into allegiance with the Tibetan Empire.
[2] After the Western Turks were conquered by the Chinese Tang dynasty his younger cousin Mishe was created khagan in 632.
Buzhen participated in the Tang-Goguryeo war in 645 and the Battle of Irtysh River where Tang armies defeated Ashina Helu.
[4] In 659 he participated in a campaign alongside Mishe against rival claimant to the title of khagan, Zhenzhu Yabgu, near Shuanghe.
in 662 Gaozong sent the general Su Haizheng (蘇海政) to attack Qiuzi and ordered Buzhen and Mishe to assist him.