Abstract: The return of Turgut tribe to the east, happened in the last half of the eighteenth century. This essay uses Manchu archives from the First Historical Archives of China as the core material，combined with related historical resources, to study the positive role the Kazakh leader Abulai played during the event, to analyze the historical truth of Abulai’s leadership of the Left Sector of the Kazahhs who did their duty as the Qing dynasty’s vassal state and participated in Qing dynasty’s borderland management. On the foundation of previous study which greatly underestimated or even denied the positive role that Abulai had played during the event, this essay advances new arguments to explain the true reason that Turgut choose to pass across Kazakh steppe. In fact, Abulai dispatched envoys to deliver news and his “Secret Reports” to Emperor Qianlong. Because of this, the Qing Court made better arrangements for the Turgut tribe. Finally, the author concludes that Abulai played role of loyal vassal to the Qing dynasty.