The article presents a comparative analysis of the problem of Chinese migrants in the Mongolian world throughout various historical periods. Constant migrations were a norm for the Mongolian world since its economy was shaped by nomadic cattle-herding. In the 20^th century the borders put limits to migrations, yet at the dawn of the 21^st century transboundary migrations quickly intensified. In each part of the Mongolian world this problem is manifested in its own form and plays a different role.