| The military struggle in the northern frontier of China had never been to halt during the period of post-Turkic. Between the groups was either unity or confrontation, which made every nation and their regime unbalance. Considering the military relations between Tang, post-Turkic and Khitan as the research object, this article by the military struggle of the three groups intend to discuss their state of rise and fall, as well as the impact to other people.As the result of the policy of preferential treatment given to the East Turkic people allegiance to Tang Dynasty, Turkic recovered their strength during the period of Tanggaozong emperor, and generated the intention of Zionist. With the exacerbation of internal contradiction of Tang Dynasty, their management to Turkic wasn't as tight as usual, so Turkic finally rebelled against Tang Dynasty in the late period of Tanggaozong emperor, from which confrontation is the normal state of the relation between Tang and Turkic. Afterwards the mismanagement of Tang Dynasty put Khitan rebel, which made the situation of northern grassland more complicated.The war between Tang, post-Turkic and Khitan let the political situation unbalance again, with the shift of the strength of every ethnic group. Eventually post-Turkic is subjugated, in accordance with the Turkic integration into other ethnic groups, which reinforced the strength of Uighur so they should dominate the northern grassland over one hundred years. Simultaneously, Khitan accelerated their change of internal power system. After development of one hundred years, Khitan turn into the new leader of northern grassland gradually. Other minorities were either greatly weaken leading to the final demise by it, or thus developed. In short, The war between Tang, post-Turkic and Khitan bring long and far-reaching impact to Tang Dynasty and other ethnic groups in the northern grassland. |