In late sixteenth century, with the link arising that Tibetan-Buddhism began to wide spread across the mongolian tribes, the close political and religious ties were established between mongolia and tibet. In 1636, four tribes of Oirat Mongolian launched the conquest of Qinghai-Tibet. After having oc-cupied Qinghai, Choros Tribe, Durbet Tribe and Turhute Tribe came back to the north of Tianshan Mountains, but Gushri Khan led the Hoshot Tribe to stay in Qinghai. In 1640 and 1642, as the apolo-getics dharmaraja of the Gelug Sect, Gushri Khan eliminated the Baili Chieftain and Tsangpa Khan II in Kham Region and gTsang, gradually unifying all of the Qinghai-Tibet Plateau. This paper plans to clar-ify the main events and the relationship of different parties in the process.%16世纪后期，藏传佛教在蒙古各部中开始广泛传播，蒙藏之间以此为纽带建立起了紧密的政治和宗教关系。1636年，在格鲁派求援的情况下，卫拉特蒙古四部联军展开了用兵青藏的征程。占领青海之后，绰罗斯部、杜尔伯特部和土尔扈特部部众返回天山以北，和硕特部固始汗率本部继续留驻青海。1640年和1642年，固始汗以格鲁派护教法王的身份分别在康区和后藏擒杀白利土司和藏巴汗二世，逐步统一了整个青藏高原。本文拟对这一过程中的主要事件和各方关系进行梳理。
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