In order to ensure normal teaching order, prote cting st ude nts ' healt hy growth, e nsuring that national (property) is not lost, to preve nt or minimize t he occurrence of safety accide nts, follow the "prevent , rescue each ot her, e nsure safety and re duce losses" pri nciple, a ccordi ng to the l ocal conditions, make the management system. 1, t he pri ncipal is the re sponsibility of school