中學學校劃線分(fen)為(wei):熱熔(rong)(rong)標線(xian)(xian)(xian)(xian)，常(chang)溫冷漆標線(xian)(xian)(xian)(xian)，彩(cai)色防滑(hua)標線(xian)(xian)(xian)(xian)，振(zhen)蕩防滑(hua)反(fan)光標線(xian)(xian)(xian)(xian)和預成型(xing)標線(xian)(xian)(xian)(xian)。 熱熔(rong)(rong)標線(xian)(xian)(xian)(xian)是我(wo)國道(dao)路(lu)標線(xian)(xian)(xian)(xian)上應(ying)用最(zui)廣的一種標線(xian)(xian)(xian)(xian)。他(ta)施(shi)工時間短，耐磨性(xing)(xing)高，造價低。 道(dao)路(lu)交(jiao)通標線(xian)(xian)(xian)(xian)主要劃(hua)設(she)于道(dao)路(lu)表面，經(jing)受日(ri)曬雨(yu)淋(lin)，風(feng)雪冰凍(dong)，遭受車(che)輛(liang)的沖(chong)擊(ji)磨耗，因此(ci)對其(qi)性(xing)(xing)能有嚴格的要求(qiu)。首(shou)先要求(qiu)干(gan)燥時間短，操作簡(jian)單(dan)，以(yi)減少(shao)交(jiao)通干(gan)擾；其(qi)次要求(qiu)反(fan)射能力強，色彩(cai)鮮明，反(fan)光度強，使白天、夜晚都有良好的能見度；第三，應(ying)具(ju)有抗滑(hua)性(xing)(xing)和耐磨性(xing)(xing)，以(yi)保證行車(che)安全和使用壽命(ming)。

根據圖樣和技術(shu)要(yao)求(qiu)，在(zai)毛坯(pi)或半成品上(shang)用(yong)劃(hua)(hua)線(xian)(xian)(xian)工(gong)具畫出加(jia)工(gong)界(jie)(jie)線(xian)(xian)(xian)，或劃(hua)(hua)出作為(wei)基準的(de)(de)點、線(xian)(xian)(xian)的(de)(de)操作過(guo)(guo)(guo)程稱為(wei)劃(hua)(hua)線(xian)(xian)(xian)。劃(hua)(hua)線(xian)(xian)(xian)分為(wei)平面(mian)(mian)劃(hua)(hua)線(xian)(xian)(xian)和立體劃(hua)(hua)線(xian)(xian)(xian)兩(liang)種。只需(xu)要(yao)在(zai)工(gong)件(jian)一(yi)(yi)個表面(mian)(mian)上(shang)劃(hua)(hua)線(xian)(xian)(xian)即能(neng)明(ming)確表明(ming)加(jia)工(gong)界(jie)(jie)限的(de)(de)，稱之為(wei)平面(mian)(mian)劃(hua)(hua)線(xian)(xian)(xian)；需(xu)要(yao)在(zai)工(gong)件(jian)幾個互成不(bu)同(tong)角度（一(yi)(yi)般是(shi)互相垂直(zhi)）的(de)(de)表面(mian)(mian)上(shang)劃(hua)(hua)線(xian)(xian)(xian)，才能(neng)明(ming)確表明(ming)加(jia)工(gong)界(jie)(jie)限的(de)(de)，稱為(wei)立體劃(hua)(hua)線(xian)(xian)(xian)。對劃(hua)(hua)線(xian)(xian)(xian)的(de)(de)基本要(yao)求(qiu)是(shi)線(xian)(xian)(xian)條清晰勻稱，定(ding)(ding)型(xing)、定(ding)(ding)位尺(chi)寸準確。由于(yu)劃(hua)(hua)線(xian)(xian)(xian)的(de)(de)線(xian)(xian)(xian)條有一(yi)(yi)定(ding)(ding)寬度，一(yi)(yi)般要(yao)求(qiu)精度達到0.25-0.5mm。應當注意，工(gong)件(jian)的(de)(de)加(jia)工(gong)精度不(bu)能(neng)完(wan)全由劃(hua)(hua)線(xian)(xian)(xian)確定(ding)(ding)，而(er)應該在(zai)加(jia)工(gong)過(guo)(guo)(guo)程中通過(guo)(guo)(guo)測量來保證。