In order to ensure normal teaching orde r, prote cting st ude nts ' healt hy growth, ensuring t hat national (property) is not l ost , to prev ent or minimize the occurrence of safety accide nts, foll ow the "preve nt, rescue ea ch other, ensure safety and reduce l osses" principle , accordi ng to the l ocal conditi ons, make the management system. 1, t he pri ncipal is the re sponsibility of scho