Abstract: According to practice development situation and requirement of system security of moni-(toring) and control system of substation of a smeltery,the paper designed a security protection management system of monitoring and control system of substation,introduced overall structure of the system,(expounded) design of system security,network platform security,application security,data security,background monitoring and control program of security protection management and so on.The system had brought into service successfully.The practice running results showed that the system had correct design and better effect.