The 8 Great Walls that amount to mountain, be located in Beijing Yan Qing area army hill closes mouth of north of channel ancient course. It is the main component of the defence project Great Wall with Chinese great ancient time, it is a mountain pass of bright Great Wall. The 8 Great Walls that amount to mountain are the important advance guard of the Juyongguan Pass, ancient say " Ju Yong's danger is not closing and be in 8 Da Ling " . According to " history write down " account and census of cultural relic worker, prove 8 Da Ling is taken build in period of the Warring States have the Great Wall, still see involuntary discharge of urine of stage of incomplete wall, mound is put now, its are moved toward, with today cardinal principle of bright Great Wall is consistent account of Chinese be used to: Ever set army, Ju Yong shuts a city twice. Northen Wei Dynasty " water classics notes " say: "The Juyongguan Pass is in the bound that reside commonplace, reason passes a name also, south criterion absolutely cereal, base stone is shut site, wall of Chong Yong high, blame small meritorious service can be lifted... south hill of its water all previous, directly army bound... " accordingly, the expert thinks Chinese buy Juyongguan Pass, close location to be in 8 Da Ling. The Northen Wei Dynasty before 1500, ever was in 8 Da Ling takes build Great Wall. According to " Zu Benji of world of book of the Kingdom of Wei " account, true gentleman of peace and tranquility of family name of postscript of develop of Northen Wei Dynasty 7 years (446 years) , the city is made the same score in national capital (today Great Harmony) with north, build Great Wall, be called " a place of strategic importance on Ji is surrounded " , rise east on cereal army hill (namely one belt of 8 Da Ling) , yellow River shore reachs on the west. Protect 6 years to day of dynasty of the Northern Qi Dynasty later (555 years) , build Great Wall, great Harmony rises on the west, classics army Shandong goes, lengthen the Great Wall to the seaside. The 8 Great Walls that amount to mountain, build at Ming Dynasty great to treat 18 years (1505) , build to what 8 Da Ling Great Walls undertook is as long as more than 80 years, in all many lis 1300. Will fight attune of light of afterwards of relative of famous general of an old name for Japan to come northward, direct Great Wall matters pertaining to defense, it is the one part of the defence project Great Wall with Chinese great ancient time. 8 Da Ling is mountain pass formerly, build after shut a city. Bright grand celebrates 3 years (1569) to 10 thousand all previous 10 years (1582) barrier a place of strategic importance is built in each, build the wall of city having a side, tip, wall that block a horse to wait on the hill of each two side, add gradually later build for the Great Wall, and stage of build enemy building, mound. From plain grass the flower supports since, mouth of temple of classics stone Buddha, green Long Qiaodong is mouth, green Long Qiao on the west mouth of mouth, king melon valley, 8 Da Ling mouth, change beam mouth, Yu Jiachong mouth of mouth, cereal of black soya bean comes Shi Xia, make an appointment with 12 kilometre endlong. The 8 Great Walls that amount to mountain, close city, city wall, fastness to reach close the Juyongguan Pass with mid channel to make bright generation Beijing's whole martial defense system. Its close the 8 Great Walls that amount to mountain the city is east narrow on the west wide echelon, close a city to have a thing 2 the forehead inscribes Mendongmen " the town outside Ju Yong " , engrave Yu Jiajing 18 years (1539) ; Door forehead is inscribed on the west " key of boreal door lock " , engrave at 10 thousand all previous 10 years (1582) . Two all are bricky stone structure, platform is on certificate hole, the north and south of the stage has a channel each, join closes city city wall, on the stage all around crenel of build by laying bricks or stones. Around builds mound station in all 1316. The 8 Great Walls that amount to mountain behaved the scene with grand and arduous Great Wall typically. As the protective screen of Beijing, chain of mountains overlaps here, phasic strategic place. The city wall north and south with extremely boundless imposing manner circles outspread Yu Qunluan in high mountain, eye shot place and, do not see an end. The Great Wall hero that spreads out to two side according to hill situation stands erect Wei Ya, the " of " natural barrier of book of place of the ancients on steep wall cliff 2 words, generalized the martial importance of the 8 positions that amount to mountain exactly.