His reign saw the raids on the Northern Wei border resumed but did not bring visible results.
In Chinese sources, the years of his reign are called the "period of mercy", but at this time in the khaganate there were frequent internecine wars of the high ranking nobles.
When nobles asked from Doulun to make peace with Wei, he accused them of treason and ordered them to be executed, together with the whole clans and up to three tribes.
Starting from 492, Doulun's cruelty and losses in battles made nobles to grow distressful.
This was a signal for nobles who killed Doulun and his mother in a coup d'état, brought their corpses to Nagai, subsequently proclaiming him khagan.