二級域名是指頂級域名之下的域名，在國際頂級域名下，它是指域名注冊人的網上名稱，例如 ibm，yahoo，microsoft等;在國家頂級域名下，它是表示注冊企業類別的符號，例如com，edu，gov，net等deng。通tong過guo搜sou索suo引yin擎qing來lai說shuo，給gei予yu一yi級ji域yu名ming域yu名ming的de權quan重zhong是shi最zui高gao的de，通tong常chang最zui先xian是shi收shou錄lu一yi級ji域yu名ming首shou頁ye的de內nei容rong。給gei予yu三san級ji域yu名ming的de權quan重zhong最zui低di，除chu非fei有you特te殊shu意yi義yi的de內nei容rong，三san級ji域yu名ming下xia麵mian的de內nei容rong很hen難nan被bei搜sou索suo引yin擎qing抓zhua取qu。根gen據ju權quan重zhong的de區qu別bie，我wo們men在zai做zuo網wang站zhan排pai名ming時shi候hou盡jin量liang采cai用yong一yi級ji域yu名ming來lai建jian站zhan。
如果要使用二級域名來做網站，那應該注意什麼呢?
一、內容與主站有區別也有聯係
erjiyumingdeneirongzuihaoshizhuzhanneirongdebuchong，biruyouyouershouchewangyijiyumingzhuzhanshiguanyuershouchejiaoyifangmiandeneirong，henshaohuijiangdaogeshengershouchedeneirong。danershouchejiaoyiyuquanguogeshengbenshenfenbukaide，suoyiwomenshelileerjiyumingbirushandongershouche，zhuyaobaokuoshandongdiquershouchejiaoyideneirong，zuoweizhuzhandelingyifangmianneirongdebeichong。rangzhuzhandeneirongdedaogenghaodeyanshen，tishengyonghutiyandeng。
二、二級域名不能爛用
二(er)級(ji)域(yu)名(ming)並(bing)不(bu)是(shi)越(yue)多(duo)越(yue)好(hao)，原(yuan)因(yin)是(shi)一(yi)級(ji)域(yu)名(ming)主(zhu)站(zhan)權(quan)重(zhong)很(hen)低(di)時(shi)，開(kai)設(she)過(guo)多(duo)二(er)級(ji)域(yu)名(ming)會(hui)分(fen)散(san)用(yong)戶(hu)的(de)點(dian)擊(ji)，降(jiang)低(di)用(yong)戶(hu)在(zai)主(zhu)站(zhan)停(ting)留(liu)時(shi)間(jian)，起(qi)到(dao)反(fan)作(zuo)用(yong)。另(ling)外(wai)二(er)級(ji)域(yu)名(ming)網(wang)站(zhan)必(bi)須(xu)有(you)獨(du)立(li)內(nei)容(rong)，不(bu)能(neng)與(yu)主(zhu)站(zhan)內(nei)容(rong)雷(lei)同(tong)，否(fou)則(ze)被(bei)認(ren)為(wei)是(shi)重(zhong)複(fu)內(nei)容(rong)。
三、各級站長的錨文本不能混鏈
womenzhuzhanzuodeshiquanguofanweideershouchejiaoyi，womenkeyikaisheerjiyumingzuodiquxingershouchejiaoyi，rushandongershouchepinggu，tianjinershouchepinggudeng。zheshiwomenzaigengxinwangzhanneirongshi，chuxianmaowenbenlianjieshiyidingbunenghunlian，zhuzhandemaowenbenbixulianjiedaozhuzhan，erjiyumingwangzhandeciyulianjiedaoziyumingwangzhanshouye。bukeyijiangziyumingguanjiancilianjiezhuzhan，zheyangjiuhuichuxianzijideyijiyumingzhuzhanyuerjiyumingwangzhanlaijingzhengguanjiancipaiming，jiushisuoweidezijihezijidaqilai。
四、二級域名開站必須先準備內容
前(qian)麵(mian)已(yi)經(jing)講(jiang)了(le)二(er)級(ji)域(yu)名(ming)網(wang)站(zhan)必(bi)須(xu)有(you)獨(du)立(li)的(de)內(nei)容(rong)，不(bu)能(neng)與(yu)主(zhu)站(zhan)內(nei)容(rong)雷(lei)同(tong)。開(kai)二(er)級(ji)域(yu)名(ming)網(wang)站(zhan)時(shi)應(ying)該(gai)準(zhun)備(bei)好(hao)相(xiang)關(guan)的(de)內(nei)容(rong)，不(bu)要(yao)臨(lin)陣(zhen)磨(mo)刀(dao)，事(shi)先(xian)把(ba)自(zi)己(ji)的(de)網(wang)站(zhan)內(nei)容(rong)存(cun)在(zai)“倉庫”裏，開站後天天發放幾篇給蜘蛛吃，這樣蜘蛛就是像難民一樣天天來領救濟糧了。
