He served as Chairman (Governor) of Inner Mongolia Autonomous Region from 1998 until his accidental death in June 2000, when his car was hit by a train at a railway crossing.

[2] On 12 June 2000, Yun Bulong was in Inner Mongolia's Xilingol League to inspect the area's sandstorm prevention work.

[2] On his way,[2] his car was hit by a train at 7:50 pm at an unguarded railway crossing in Sengedrai, Zhenglan (Xulun Hoh) Banner.

[3] Yun Bulong's untimely death caught the Chinese national leaders unprepared, as he had only served half of his five-year term.

Premier Zhu Rongji was reportedly angered and alarmed by the poor protection afforded to such a high-ranking leader.