“幽州之地沃野千里,北限大山重峦,中有五关,居庸可以通大车通转饷,松亭、金坡、古北口只通人马,不可行车。外有十八路尽兔径鸟道,只能通人,不可行马。”1由于地势险峻、位置重要,幽州自古就是中原农耕民族与北方游牧民族军事冲突与文化交流的前沿和重镇。“自唐末幽、蓟割据,戍兵废散,契丹因得出陷平、营,而幽、蓟之人岁苦寇钞。自涿州至幽州百里,人迹断绝,转饷常以兵护送,契丹多伏兵盐沟以击夺之。”2趁中原大乱、藩镇相攻,崛起于松漠之间的 “You state land fertile ground thousands of miles, the northern limit mountains Luan, there are five levels, can pass through the trolley pass rates, pine, golden slope, Gubeikou only people, not driving. Because of the steep terrain and its important position, Youzhou has been the forefront and center of military conflicts and cultural exchanges between the farming peoples of the Central Plains and nomadic peoples in the north for many years. Since the late Tang quiet, thistle separatist, Garrison disintegrated, the Khitan drawn flat, camp, and quiet, thistle of the people bitter Kou banknote. From Pizhou to Youzhou Barry, Soldiers escort, Khitan volcanic salt ditch to capture it. ”2 while the Central Plains chaos, feudal phase of the attack, the rise in the loose between