城(cheng)(cheng)(cheng)(cheng)址位于甘肅(su)省(sheng)夏河縣駐地(di)拉卜(bu)楞鎮(zhen)東北(bei)(bei)24公里白石崖南麓、央曲北(bei)(bei)岸。漢(han)代(dai)(dai)曾在此(ci)設白石縣，古(gu)為(wei)軍事交(jiao)通(tong)要地(di)。古(gu)八(ba)角(jiao)(jiao)(jiao)城(cheng)(cheng)(cheng)(cheng)為(wei)一(yi)空(kong)心十字形(xing)(xing)城(cheng)(cheng)(cheng)(cheng)。在十字城(cheng)(cheng)(cheng)(cheng)各角(jiao)(jiao)(jiao)上設城(cheng)(cheng)(cheng)(cheng)墩八(ba)個(ge)，形(xing)(xing)成八(ba)角(jiao)(jiao)(jiao)，故名。古(gu)城(cheng)(cheng)(cheng)(cheng)占地(di)20萬平方米，城(cheng)(cheng)(cheng)(cheng)墻周(zhou)長(chang)2193米，墻高達10米。東西(xi)(xi)甕城(cheng)(cheng)(cheng)(cheng)有(you)s形(xing)(xing)通(tong)道。城(cheng)(cheng)(cheng)(cheng)外有(you)護城(cheng)(cheng)(cheng)(cheng)河。北(bei)(bei)城(cheng)(cheng)(cheng)(cheng)依山(shan)、無門，從(cong)西(xi)(xi)城(cheng)(cheng)(cheng)(cheng)經(jing)南門至東城(cheng)(cheng)(cheng)(cheng)筑有(you)外廓，南門外筑有(you)外城(cheng)(cheng)(cheng)(cheng)。城(cheng)(cheng)(cheng)(cheng)墻以沙(sha)土、蘆(lu)葦、紅柳(liu)等層層夯(hang)筑而成。至今保存完好(hao)。由(you)于墻面多，對城(cheng)(cheng)(cheng)(cheng)下(xia)弩射無死角(jiao)(jiao)(jiao)，故易守難攻。八(ba)角(jiao)(jiao)(jiao)城(cheng)(cheng)(cheng)(cheng)壁壘(lei)建筑突(tu)破方形(xing)(xing)、矩形(xing)(xing)格局，式樣(yang)奇特(te)，不同(tong)于一(yi)般(ban)古(gu)城(cheng)(cheng)(cheng)(cheng)。據考(kao)證(zheng)，它可(ke)能就是唐代(dai)(dai)雕窩城(cheng)(cheng)(cheng)(cheng)，宋代(dai)(dai)的一(yi)公城(cheng)(cheng)(cheng)(cheng)。
八(ba)角城(cheng)故(gu)址的建筑形式，是我國古代城(cheng)堡傳(chuan)統的建筑形式，外掘城(cheng)壕，內建城(cheng)堡，引水護(hu)城(cheng)。城(cheng)墻(qiang)為夯(hang)層夾(jia)棍(gun)做(zuo)法(fa)，夾(jia)棍(gun)粗(cu)細較均勻，且排列有(you)(you)序。城(cheng)墻(qiang)下(xia)部夯(hang)層較厚(hou)(22厘米(mi))，夯(hang)土層間有(you)(you)砂石伴有(you)(you)樹枝。緊連(lian)內角的外角處有(you)(you)馬(ma)面。
城(cheng)(cheng)中發現了(le)大量的(de)(de)文物(wu),有唐(tang)宋時期(qi)的(de)(de)金屬 貨(huo)幣、方(fang)磚、條磚、筒瓦、板瓦、碓(dui)舀(yao)、礎石(shi)、城(cheng)(cheng)門樞舀(yao)、碾盤等。在八角(jiao)城(cheng)(cheng)周(zhou)圍的(de)(de)平(ping)地、丘陵、臺地上(shang),還保留 有不(bu)少古代棄(qi)耕的(de)(de)梯田,有些(xie)梯田一直修到山(shan)頂。八角(jiao) 城(cheng)(cheng)在宋代為黨項、西夏(xia)、唃廝啰活(huo)動(dong)和(he)爭戰的(de)(de)中心。
八角城(cheng)(cheng)故址(zhi)位(wei)于夏河(he)縣(xian)城(cheng)(cheng)北35公里大夏河(he)(古稱漓(li)水)支(zhi)流央曲河(he)上(shang)(shang)(shang)游且(qie)隆溝(gou)(gou)內臺(tai)地上(shang)(shang)(shang)，海(hai)拔2100米。出(chu)且(qie)隆溝(gou)(gou)經過(guo)懷羌城(cheng)(cheng)(即麻(ma)當(dang)古城(cheng)(cheng))、土門關，直通(tong)(tong)臨夏。西邊是廣(guang)闊的(de)(de)大草(cao)原，其西北通(tong)(tong) 道八角城(cheng)(cheng)故址(zhi)位(wei)于夏河(he)縣(xian)城(cheng)(cheng)北35公里大夏河(he)(古稱漓(li)水)支(zhi)流央曲河(he)上(shang)(shang)(shang)游且(qie)隆溝(gou)(gou)內臺(tai)地上(shang)(shang)(shang)，海(hai)拔2100米。出(chu)且(qie)隆溝(gou)(gou)經過(guo)懷羌城(cheng)(cheng)(即麻(ma)當(dang)古城(cheng)(cheng))、土門關，直通(tong)(tong)臨夏。西邊是廣(guang)闊的(de)(de)大草(cao)原，其西北通(tong)(tong)過(guo)達里加(jia)山隘口，可直通(tong)(tong)青海(hai)。1981年(nian)，甘肅省人民政(zheng)府(fu)公布八角城(cheng)(cheng)故址(zhi)為省級文物保(bao)護單位(wei)。
八角(jiao)城所在地(di)四周山巒(luan)環抱，地(di)層(ceng)屬于巴顏喀喇一一秦嶺地(di)層(ceng)區北秦嶺地(di)層(ceng)下白堊(e)紀，城北是(shi)著(zhu)名的(de)白石(shi)崖(ya)。甘加鄉(xiang)盆(pen)地(di)中草灘(tan)廣闊，谷溝寬敞，溪流(liu)縱橫(heng)，自古以來(lai)是(shi)天(tian)然的(de)優(you)質(zhi)牧(mu)場，盛產甘加羊、牦牛、蕨麻豬等優(you)質(zhi)品種。草甸邊緣，巖(yan)石(shi)裸(luo)露(lu)、斷崖(ya)百(bai)丈，形(xing)成了橫(heng)亙10余里的(de)白石(shi)崖(ya)矗壁，其主(zhu)峰(feng)達里加山海拔4636米，為夏河(he)縣(xian)第一高峰(feng)。
八(ba)(ba)角(jiao)(jiao)城憑山依水，居高臨下，內(nei)(nei)城外(wai)廓，引水護城，層層設防，首尾相(xiang)顧。而總體布局又(you)和(he)(he)(he)一般(ban)城堡(bao)又(you)不(bu)相(xiang)同，特別是內(nei)(nei)城20個面、16個外(wai)角(jiao)(jiao)(8個外(wai)直(zhi)角(jiao)(jiao)抹平后變為(wei)16個外(wai)角(jiao)(jiao))和(he)(he)(he)4個內(nei)(nei)直(zhi)角(jiao)(jiao)相(xiang)互照應，克服了一般(ban)城堡(bao)在防御(yu)上不(bu)可(ke)避免死角(jiao)(jiao)的弊(bi)病。是一座(zuo)防御(yu)性甚強的城堡(bao)。北京(jing)故宮(gong)外(wai)圍城墻(qiang)的建筑形制與(yu)八(ba)(ba)角(jiao)(jiao)城的建筑極為(wei)相(xiang)似。因(yin)此，八(ba)(ba)角(jiao)(jiao)城故址為(wei)研究中國古代建城史具有極高的藝(yi)術和(he)(he)(he)科研價值。
八(ba)角城(cheng)(cheng)因其(qi)有(you)八(ba)個城(cheng)(cheng)角而(er)得(de)名，城(cheng)(cheng)廓是一個空心的十字(zi)形。八(ba)角城(cheng)(cheng)全長2193.4米(mi)，合2.2公里，城(cheng)(cheng)內占地300畝。城(cheng)(cheng)外有(you)護城(cheng)(cheng)河、護城(cheng)(cheng)壕，還有(you)外廓，南門外另有(you)外城(cheng)(cheng)。
從建筑(zhu)工藝上看，該城系唐以前所建，建筑(zhu)形(xing)式上突(tu)破(po)了方形(xing)格局，十分獨特。城雖(sui)不(bu)小，但(dan)城角之間距離(li)均(jun)在弓弩的有效(xiao)射程(cheng)之內，可互為照(zhao)應，因而易守難攻(gong)。
八(ba)角(jiao)城(cheng)(cheng)(cheng)(cheng)，藏(zang)語稱(cheng)“卡爾昂”，藏(zang)文史稱(cheng)為(wei)“雍仲(zhong)卡爾”，意為(wei)“萬字城(cheng)(cheng)(cheng)(cheng)”，實際是一個(ge)空心(xin)的(de)“十(shi)”字形(xing)城(cheng)(cheng)(cheng)(cheng)。它打破了傳統的(de)方城(cheng)(cheng)(cheng)(cheng)構筑慣例，內城(cheng)(cheng)(cheng)(cheng)為(wei)空心(xin)十(shi)字型，但(dan)截去城(cheng)(cheng)(cheng)(cheng)垣四(si)面(mian)凸出部(bu)分的(de)8個(ge)角(jiao)，形(xing)成為(wei)20個(ge)面(mian)，在“十(shi)”字的(de)各角(jiao)上有(you)(you)(you)馬(ma)面(mian)，計8個(ge)。早在漢代，這里(li)就(jiu)設有(you)(you)(you)白(bai)石縣(xian)(xian)，《漢書》卷二十(shi)八(ba)下：金城(cheng)(cheng)(cheng)(cheng)郡轄縣(xian)(xian)十(shi)三，其中有(you)(you)(you)白(bai)石縣(xian)(xian)，并有(you)(you)(you)離水出西塞外，東至袍罕(han)入河。王(wang)莽時期稱(cheng)之(zhi)為(wei)頃礫。是絲綢(chou)之(zhi)路河南(nan)道上的(de)重要軍事建筑遺址。
絲(si)綢之路(lu)河南道開創(chuang)于南北(bei)朝時期，是(shi)(shi)由(you)(you)西(xi)域(yu)、漠北(bei)、涼州(zhou)出發(fa)，經(jing)(jing)吐(tu)谷(gu)(gu)(gu)渾(hun)河南國，而往古(gu)(gu)代(dai)益州(zhou)、建(jian)康去的(de)(de)國際通(tong)道。它由(you)(you)許多(duo)路(lu)線(xian)組成，但主(zhu)要路(lu)線(xian)是(shi)(shi)：由(you)(you)若羌、敦煌或武威(涼州(zhou))出發(fa)，經(jing)(jing)過青海(hai)湖至(zhi)黃河以(yi)南的(de)(de)吐(tu)谷(gu)(gu)(gu)渾(hun)地(di)(di)區(qu)(qu)，而抵達長江上游的(de)(de)松(song)潘地(di)(di)區(qu)(qu)，再由(you)(you)松(song)潘地(di)(di)區(qu)(qu)沿岷江而下至(zhi)成都。這條路(lu)線(xian)在甘肅省境內有三段(duan)：由(you)(you)松(song)潘出發(fa)，沿東岷江而上，經(jing)(jing)南坪(ping)至(zhi)文(wen)(wen)縣(xian)(xian)，這是(shi)(shi)陰平南支道；第(di)(di)二段(duan)是(shi)(shi)陰平中(zhong)支道西(xi)段(duan)，由(you)(you)文(wen)(wen)縣(xian)(xian)出發(fa)，經(jing)(jing)峰(feng)迭、華嚴諸古(gu)(gu)城(cheng)，至(zhi)迭部；第(di)(di)三段(duan)是(shi)(shi)河南中(zhong)支道，由(you)(you)迭部出發(fa)，經(jing)(jing)碌曲(qu)、夏河、臨夏，至(zhi)西(xi)寧。這條路(lu)線(xian)的(de)(de)沿線(xian)多(duo)保留(liu)大量(liang)的(de)(de)古(gu)(gu)代(dai)城(cheng)址，分布線(xian)路(lu)比較分明，由(you)(you)松(song)潘向(xiang)東北(bei)方向(xiang)延伸，多(duo)半都是(shi)(shi)吐(tu)谷(gu)(gu)(gu)渾(hun)時期與唐代(dai)的(de)(de)。此次勘察(cha)時，我(wo)們在八(ba)角(jiao)城(cheng)內發(fa)現(xian)一些(xie)魏晉時期的(de)(de)殘磚斷瓦。據當(dang)地(di)(di)文(wen)(wen)物(wu)部門的(de)(de)同志講，他們曾經(jing)(jing)在—八(ba)角(jiao)城(cheng)故址征集到大量(liang)唐、宋時期的(de)(de)金屬貨幣，發(fa)現(xian)了新莽貨幣及其他文(wen)(wen)物(wu)。因此，可初步推測(ce)：八(ba)角(jiao)城(cheng)即(ji)漢代(dai)的(de)(de)白(bai)石(shi)城(cheng)、唐代(dai)的(de)(de)雕窩城(cheng)、宋代(dai)的(de)(de)移公城(cheng)。
由于絲(si)綢之路河南道(dao)的(de)逐(zhu)漸廢棄，又成為(wei)唐(tang)蕃古道(dao)上的(de)重要軍事設施(shi)，因此(ci)，八角城在(zai)唐(tang)、宋(song)時期，具(ju)有雙重身份：
其一(yi)(yi)，是(shi)延續絲綢(chou)之(zhi)路河(he)南道的(de)交通(tong)(tong)要(yao)道作用，并成為(wei)(wei)吐蕃地方政(zheng)權響廝噦(hui)“聯宋(song)抗夏”、溝通(tong)(tong)漢藏商(shang)路和(he)在西夏截斷(duan)河(he)西走(zou)廊(lang)絲綢(chou)之(zhi)路中(zhong)線(xian)(xian)后南線(xian)(xian)上的(de)重要(yao)通(tong)(tong)道。該城(cheng)(cheng)(cheng)在唐代稱(cheng)“一(yi)(yi)公(gong)(gong)城(cheng)(cheng)(cheng)”、“雕窩城(cheng)(cheng)(cheng)”、“葉(xie)公(gong)(gong)城(cheng)(cheng)(cheng)”。宋(song)崇(chong)寧(ning)二(er)年(nian)改(gai)名為(wei)(wei)循(xun)化城(cheng)(cheng)(cheng)。《宋(song)史(shi)·地理志》稱(cheng)：“循(xun)化城(cheng)(cheng)(cheng)， 舊一(yi)(yi)公(gong)(gong)城(cheng)(cheng)(cheng)，崇(chong)寧(ning)二(er)年(nian)收復，改(gai)今名”。“樂州(zhou)。舊邈川城(cheng)(cheng)(cheng)，元符(fu)二(er)年(nian)收復，建(jian)(jian)為(wei)(wei)湟州(zhou)，建(jian)(jian)中(zhong)靖國(guo)元年(nian)棄之(zhi)。崇(chong)寧(ning)二(er)年(nian)又復。三年(nian)，置倚郭縣，五(wu)年(nian)罷(ba)。大觀(guan)三年(nian)，加向(xiang)德軍節(jie)度。宣和(he)元年(nian)，改(gai)為(wei)(wei)樂州(zhou)”。
其(qi)二，是(shi)唐蕃(fan)古(gu)道上(shang)的重要軍事設(she)置，是(shi)中(zhong)央(yang)王朝保護絲綢(chou)之路(lu)南(nan)線暢通和保障郵驛(yi)安全的重要設(she)施。唐蕃(fan)古(gu)道在(zai)甘(gan)肅省(sheng)境(jing)內越過陜(shan)甘(gan)兩省(sheng)界山——隴(long)山到達秦州(zhou)(今甘(gan)肅天水)，溯渭水繼續西(xi)上(shang)越鳥鼠山到臨州(zhou)(甘(gan)肅臨洮)。從臨洮西(xi)北(bei)行，經河州(zhou)(甘(gan)肅臨夏(xia))渡黃河進(jin)入(ru)青海(hai)(hai)境(jing)內，再經龍支城(cheng)(cheng)(青海(hai)(hai)民(min)和柴溝(gou)北(bei)古(gu)城(cheng)(cheng))西(xi)北(bei)行到鄯州(zhou)(青海(hai)(hai)樂(le)都)，可以(yi)稱古(gu)道東段，全在(zai)唐王朝境(jing)內，這是(shi)漢代(dai)以(yi)來從中(zhong)原進(jin)入(ru)河湟地區的傳統路(lu)線。城(cheng)(cheng)內出土有大量(liang)唐、宋時期的建筑(zhu)構件和文物。
元、明(ming)時期，八角(jiao)城(cheng)開始(shi)廢棄，但只是一(yi)座重要的(de)驛站。宋(song)代(dai)所稱的(de)“移公城(cheng)”在明(ming)代(dai)即(ji)青海蒙古(gu)火落赤的(de)駐牧地捏貢川。清(qing)代(dai)以(yi)來稱甘加川，即(ji)今大夏(xia)河的(de)支(zhi)流(liu)鐵龍溝(gou)，《中國歷史(shi)地圖集·北宋(song)秦鳳路圖》亦將移公城(cheng)位(wei)置標示于此一(yi)帶。
清代(dai)(dai)初年(nian)準備在這里(li)開墾屯田，但由于(yu)自然(ran)條件較差而未能實施(shi)。乾(qian)隆年(nian)間始有(you)“八(ba)角(jiao)(jiao)(jiao)城”的名(ming)稱，乾(qian)隆七年(nian)《大(da)學士鄂爾泰為遵旨(zhi)議(yi)復捏(nie)貢(gong)川地(di)(di)方屯田事奏折(zhe)》：“查從前鄂彌達奏請將(jiang)河州八(ba)角(jiao)(jiao)(jiao)城之(zhi)捏(nie)貢(gong)川地(di)(di)方挑浚河渠，開墾荒地(di)(di)。臣等議(yi)令該(gai)督撫委(wei)員查勘，于(yu)奏到(dao)之(zhi)日再議(yi)。捏(nie)貢(gong)川遠(yuan)在番夷(yi)，泉水既(ji)不足以灌(guan)田，而地(di)(di)土(tu)又難于(yu)開墾，兼之(zhi)地(di)(di)寒霜(shuang)早，不能必其成熟，徒勞民力，虛糜帑項，均屬無(wu)益。”清政府放棄(qi)在此地(di)(di)開墾土(tu)地(di)(di)的計劃(hua)，說(shuo)明在清代(dai)(dai)時八(ba)角(jiao)(jiao)(jiao)城已廢棄(qi)。
據當地(di)一位88歲的藏民回憶，清代末(mo)年，八(ba)(ba)角(jiao)(jiao)城(cheng)(cheng)內(nei)尚無(wu)居(ju)民居(ju)住，城(cheng)(cheng)內(nei)居(ju)住少量(liang)(liang)的清兵。民國時期，當地(di)漢(han)(han)、藏居(ju)民開始大量(liang)(liang)入住八(ba)(ba)角(jiao)(jiao)城(cheng)(cheng)。八(ba)(ba)角(jiao)(jiao)城(cheng)(cheng)故址(zhi)內(nei)現(xian)有七十余(yu)戶(hu)人家，五百多人，藏、漢(han)(han)雜居(ju)。藏族居(ju)民有三分(fen)之二，八(ba)(ba)角(jiao)(jiao)城(cheng)(cheng)村是(shi)附近地(di)區(qu)大的自然(ran)村。全村以放牧為主，略做些農業。村中小學學習藏、漢(han)(han)兩種語言。
八角(jiao)城(cheng)故址方位(wei)正北(bei)(bei)，總體上呈北(bei)(bei)高(gao)南(nan)低(di)，南(nan)北(bei)(bei)高(gao)差6米(mi)(mi)(mi)(mi)左右(you)；西(xi)(xi)高(gao)東(dong)低(di)，東(dong)西(xi)(xi)高(gao)差3米(mi)(mi)(mi)(mi)左右(you)。整個(ge)城(cheng)垣保(bao)存較好。城(cheng)墻是由一(yi)(yi)層(ceng)(ceng)土一(yi)(yi)層(ceng)(ceng)砂(sha)石(shi)夯筑而(er)成(cheng)。一(yi)(yi)般土層(ceng)(ceng)厚8一(yi)(yi)12厘(li)米(mi)(mi)(mi)(mi)，砂(sha)石(shi)層(ceng)(ceng)厚3厘(li)米(mi)(mi)(mi)(mi)左右(you)，南(nan)甕城(cheng)及(ji)其(qi)他局(ju)部(bu)(bu)地(di)方底(di)部(bu)(bu)夯層(ceng)(ceng)厚22厘(li)米(mi)(mi)(mi)(mi)，夾(jia)棍(gun)垂直(zhi)距離42—110厘(li)米(mi)(mi)(mi)(mi)，水平(ping)相(xiang)距不均，夾(jia)棍(gun)眼直(zhi)徑為(wei)10厘(li)米(mi)(mi)(mi)(mi)左右(you)。城(cheng)墻外(wai)(wai)圍周長為(wei)2540米(mi)(mi)(mi)(mi)。現(xian)存城(cheng)墻殘高(gao)6米(mi)(mi)(mi)(mi)一(yi)(yi)13米(mi)(mi)(mi)(mi)：城(cheng)墻底(di)寬(kuan)1l米(mi)(mi)(mi)(mi)一(yi)(yi)13米(mi)(mi)(mi)(mi)，上寬(kuan)5米(mi)(mi)(mi)(mi)一(yi)(yi)18米(mi)(mi)(mi)(mi)。城(cheng)四面(mian)正中有甕城(cheng)。東(dong)、西(xi)(xi)兩面(mian)緊鄰甕城(cheng)的南(nan)側各有一(yi)(yi)夾(jia)道，形似“S”，東(dong)面(mian)夾(jia)道寬(kuan)5米(mi)(mi)(mi)(mi)(殘)；西(xi)(xi)面(mian)夾(jia)道寬(kuan)3米(mi)(mi)(mi)(mi)。整個(ge)城(cheng)的8個(ge)外(wai)(wai)角(jiao)均被(bei)抹平(ping)，形成(cheng)了16個(ge)外(wai)(wai)角(jiao)，內角(jiao)為(wei)直(zhi)角(jiao)，緊鄰直(zhi)角(jiao)的外(wai)(wai)角(jiao)處均有一(yi)(yi)馬面(mian)，現(xian)存馬面(mian)6個(ge)。城(cheng)墻外(wai)(wai)圍有一(yi)(yi)護城(cheng)壕，護城(cheng)壕不完整，殘存部(bu)(bu)分(fen)寬(kuan)4米(mi)(mi)(mi)(mi)一(yi)(yi)6米(mi)(mi)(mi)(mi)，深2米(mi)(mi)(mi)(mi)一(yi)(yi)6米(mi)(mi)(mi)(mi)，護城(cheng)壕外(wai)(wai)有護城(cheng)河(he)，寬(kuan)6米(mi)(mi)(mi)(mi)一(yi)(yi)14米(mi)(mi)(mi)(mi)，深2米(mi)(mi)(mi)(mi)一(yi)(yi)13米(mi)(mi)(mi)(mi)，護城(cheng)河(he)水引自言江(央拉河(he))水，河(he)水從城(cheng)北(bei)(bei)分(fen)兩支(zhi)流繞城(cheng)向南(nan)流，后匯入央曲(qu)河(he)。護城(cheng)河(he)外(wai)(wai)有外(wai)(wai)廓，外(wai)(wai)廓輪廓西(xi)(xi)、北(bei)(bei)兩面(mian)較明(ming)顯。
八角城南面(mian)甕城外東南角有一外城，城廓明(ming)顯，根據地形而建，呈現出不規則的(de)(de)長(chang)方形，長(chang)寬為130~66米。從位置(zhi)分析，似是經過此地的(de)(de)商人居(ju)住之地，相當于今天(tian)的(de)(de)旅館。但有人認為是練兵場。
在(zai)城內(nei)居民家(jia)中發(fa)現(xian)的(de)少(shao)量的(de)金(jin)屬(shu)貨(huo)幣，基本上屬(shu)于宋(song)、明、清(qing)時期。同時還有元代少(shao)數(shu)民族銅(tong)飾牌和刻有“吳興”銘(ming)文的(de)銅(tong)牌，明代的(de)宣德爐(lu)和清(qing)代的(de)酥油燈等(deng)。據(ju)當地居民講，文物(wu)(wu)販(fan)子(zi)(zi)經常出(chu)現(xian)在(zai)八(ba)角城村，居民們(men)家(jia)中的(de)許(xu)多(duo)文物(wu)(wu)已(yi)經出(chu)售(shou)給文物(wu)(wu)販(fan)子(zi)(zi)。當地居民家(jia)中還保存大量的(de)灰布紋瓦、勾頭(tou)滴水(shui)、吻獸及門(men)枕石等(deng)建筑構件。
根據歷年(nian)來征集(ji)到的(de)文物(wu)以(yi)及史料的(de)記載(zai)，八角(jiao)(jiao)城應初建于南(nan)北朝時(shi)期，宋代進行了完整(zheng)的(de)修筑過程，從(cong)筑城的(de)技法上看，元代也進行了較大規模的(de)修繕工程。清代時(shi)，八角(jiao)(jiao)城已被(bei)放棄。
秦漢時(shi)期，甘(gan)南屬于西(xi)羌，甘(gan)加(jia)地(di)區因地(di)利位置的(de)特殊，在此(ci)設(she)置白石(shi)縣。甘(gan)加(jia)草原是(shi)(shi)古(gu)代(dai)隴右通(tong)(tong)(tong)往(wang)青海東(dong)(dong)南部的(de)門戶，八角城位居此(ci)道(dao)的(de)必(bi)經之處，而此(ci)處又成為(wei)東(dong)(dong)連(lian)袍(pao)罕(今(jin)臨夏)，西(xi)通(tong)(tong)(tong)西(xi)平 (今(jin)樂(le)都)之咽喉要津。北(bei)宋時(shi)期，西(xi)夏東(dong)(dong)侵(qin)北(bei)宋疆土，并切斷河西(xi)走廊。確廝噦“聯宋抗夏”，開辟了(le)南絲(si)綢(chou)之路，并保(bao)證了(le)絲(si)綢(chou)之路南線(xian)暢(chang)通(tong)(tong)(tong)無阻。絲(si)綢(chou)之路南線(xian)是(shi)(shi)宋代(dai)通(tong)(tong)(tong)往(wang)西(xi)域的(de)通(tong)(tong)(tong)道(dao)。此(ci)地(di)地(di)名(ming)雖經多(duo)次變更，而各朝(chao)歷(li)代(dai)的(de)高(gao)統(tong)治者對此(ci)道(dao)也(ye)極為(wei)重視。因此(ci)，八角城在歷(li)史上溝通(tong)(tong)(tong)漢人與其他民族關系、疏(shu)通(tong)(tong)(tong)貿易渠道(dao)及和平友好往(wang)來起(qi)到了(le)積(ji)極的(de)作(zuo)用。
八(ba)(ba)角(jiao)(jiao)城(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)故(gu)址的(de)(de)(de)(de)建(jian)(jian)筑(zhu)形式(shi)，是我國(guo)(guo)古代城(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)堡傳統的(de)(de)(de)(de)建(jian)(jian)筑(zhu)形式(shi)，外(wai)掘城(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)壕，內(nei)(nei)建(jian)(jian)城(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)堡，引(yin)水(shui)護(hu)城(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)。城(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)墻為夯層(ceng)夾棍(gun)做(zuo)法，夾棍(gun)粗(cu)細(xi)較均勻，且排(pai)列有(you)序。城(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)墻下部(bu)夯層(ceng)較厚(hou)(22厘米(mi))，夯土(tu)層(ceng)間有(you)砂石伴有(you)樹枝。緊連內(nei)(nei)角(jiao)(jiao)的(de)(de)(de)(de)外(wai)角(jiao)(jiao)處有(you)馬面。八(ba)(ba)角(jiao)(jiao)城(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)憑山(shan)依水(shui)，居高臨(lin)下，內(nei)(nei)城(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)外(wai)廓(kuo)，引(yin)水(shui)護(hu)城(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)，層(ceng)層(ceng)設(she)防，首尾相(xiang)顧。而總(zong)體布局(ju)又和(he)一(yi)般城(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)堡又不相(xiang)同(tong)，特別是內(nei)(nei)城(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)20個(ge)面、16個(ge)外(wai)角(jiao)(jiao)(8個(ge)外(wai)直角(jiao)(jiao)抹(mo)平后變為16個(ge)外(wai)角(jiao)(jiao))和(he)4個(ge)內(nei)(nei)直角(jiao)(jiao)相(xiang)互照應，克(ke)服了一(yi)般城(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)堡在(zai)防御上不可(ke)避免死角(jiao)(jiao)的(de)(de)(de)(de)弊病。是一(yi)座防御性甚強的(de)(de)(de)(de)城(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)堡。北京(jing)故(gu)宮外(wai)圍城(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)墻的(de)(de)(de)(de)建(jian)(jian)筑(zhu)形制(zhi)與八(ba)(ba)角(jiao)(jiao)城(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)的(de)(de)(de)(de)建(jian)(jian)筑(zhu)極為相(xiang)似。因(yin)此(ci)，八(ba)(ba)角(jiao)(jiao)城(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)故(gu)址為研(yan)究中國(guo)(guo)古代建(jian)(jian)城(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)(cheng)史(shi)具有(you)極高的(de)(de)(de)(de)藝術和(he)科研(yan)價值。
經考(kao)古(gu)(gu)專家調查、勘測，所得出的(de)(de)初步(bu)結(jie)(jie)論為，八(ba)角(jiao)城(cheng)(cheng)(cheng)在(zai)(zai)(zai)0.5平方公里的(de)(de)范圍內設城(cheng)(cheng)(cheng)建制(zhi)，以其城(cheng)(cheng)(cheng)為正南(nan)北(bei)方位的(de)(de)中軸線(xian)來看，已屬我國古(gu)(gu)代社會典型的(de)(de)城(cheng)(cheng)(cheng)市(shi)風(feng)貌。城(cheng)(cheng)(cheng)墻下(xia)層(ceng)(ceng)整土層(ceng)(ceng)常夾(jia)有(you)新石器時(shi)代碎(sui)陶(tao)(tao)片(pian)，其上層(ceng)(ceng)也(ye)有(you)唐、宋以來的(de)(de)陶(tao)(tao)片(pian)出現，再(zai)加上城(cheng)(cheng)(cheng)外(wai)西北(bei)高地漢(han)(han)墓群和出土王莽時(shi)代貨幣，推(tui)出八(ba)角(jiao)城(cheng)(cheng)(cheng)建于漢(han)(han)代。八(ba)角(jiao)城(cheng)(cheng)(cheng)以它特(te)有(you)的(de)(de)城(cheng)(cheng)(cheng)垣結(jie)(jie)構，為我們展(zhan)現了古(gu)(gu)代屯田(tian)點上設計守防城(cheng)(cheng)(cheng)市(shi)的(de)(de)風(feng)貌，在(zai)(zai)(zai)城(cheng)(cheng)(cheng)堡的(de)(de)設計上突破過去(qu)(qu)方形、矩形的(de)(de)整框框而自然體(ti)系，在(zai)(zai)(zai)我國現存在(zai)(zai)(zai)中突破過去(qu)(qu)方形、矩形的(de)(de)整框框而自成(cheng)體(ti)系。
我心明亮 
