In order to ensure normal teaching order, prote cting st ude nts ' healthy gr owth, e nsuring that national (property) is not lost, to preve nt or minimize t he occurrence of safety acci dents, follow t he "prevent, re scue each other, e nsure safety and re duce losses" pri nciple, a ccording t o the local conditions, make the manag ement system. 1, t he pri ncipal is the re sponsibility of school