遺(yi)址周長2000米(mi)(mi),方(fang)圓(yuan)25萬平方(fang)米(mi)(mi),城四周為3至4米(mi)(mi)高(gao)的墻(qiang),每隔(ge)40米(mi)(mi)有一箭(jian)樓(lou),高(gao)約4米(mi)(mi)。護(hu)城河底寬5米(mi)(mi)。
遼邊(bian)城(cheng)(cheng)(cheng)是遼朝(chao)在(zai)當(dang)時特定(ding)(ding)的歷(li)史條(tiao)件下,為(wei)防(fang)御阻卜、室韋、羽厥和烏古(gu)(gu)敵烈(lie)等西北諸部族(zu),在(zai)蒙古(gu)(gu)草(cao)原地(di)(di)帶(dai)建(jian)立的城(cheng)(cheng)(cheng)郭。由于這些城(cheng)(cheng)(cheng)郭并(bing)不是遼朝(chao)的行政(zheng)建(jian)置(zhi),而是因防(fang)守駐兵需(xu)要(yao)(yao),在(zai)地(di)(di)理環境險要(yao)(yao)地(di)(di)點建(jian)立起來的,故(gu)(gu)其(qi)規模與建(jian)筑(zhu)形式和分布(bu)等都(dou)沒(mei)有統(tong)一要(yao)(yao)求,許多城(cheng)(cheng)(cheng)郭是在(zai)空地(di)(di)上新創建(jian)的,城(cheng)(cheng)(cheng)郭大小距(ju)邊(bian)界線遠近,也(ye)都(dou)視需(xu)要(yao)(yao)而定(ding)(ding)。因其(qi)作用(yong)途是軍事(shi)防(fang)御,駐扎兵卒,而不是政(zheng)治中心,故(gu)(gu)城(cheng)(cheng)(cheng)郭內沒(mei)有貿(mao)易場(chang)所。