This paper mainly discusses the process of Dubushu's beginning, developing and declining, in order to reflect the changing of military policy or other policies in the early stage of Beisong dynasty .The full thesis is divided into eight parts;Part 1 mainly looks back the present research situation of military system in beisong dynasty. And on base of this, it states the author's research direction and the reasons.Part 2 states the origin of the Dubushu. Dubushu should be Du-du of Chaowei dynasty and Zongguan of Beizhou dynasty. And, Dubushu, Du-du and Zongguan are alike in many places.Part 3 states the Dubushu of Wudai dynasty. It mainly discusses the time of the Dubushu's forming, the relationship of Dubushu and Zongghuan, and Dubushu's type.Part 4 states the Dubushu of Song-taizu , at that time they made much success .and so at Song-taizu's time , Dubushu's position is high. Many minintary governors were named to be Dubushu.Part 5 states the dubushu in Song-taizong's time. At that time there were Zhupo-Dubushu who were art governors. Different from former Dubushu , they ofen failed in war. So we can tell that there has the policy of zhong-wen-qin-wu at Song-tai-zong's time.Part 6 states the Dubushu at Song-zhenzong's time when Xingying-Dubushu had disappeared and only Zhupo-Dubushu reserved. More and more art governors were named to be Dubushu. And so we can tell that the policy of Zhong-wen-qing-wu didn't formed until Song-zhenzong.Part 7 states the Dubushu of Song-renzong. It tells us Wenchen-zhizhou held a concurrent post of Dubushu. Military-governors only heldVice-dubushu. And from this time,there were Road-degree Dubushu, which demonstrates that Dubushu has become governors of locality.Part 8 is the conclusion, which reviews and summarizes this paper and systematically the main points of view of this paper. |