In order to improve the security of power system communication network in the emerging network security environment and distribution network accessing environment

a forward isolation device based on deep packet inspection and security enhancement is proposed. Based on the principle and vulnerability analysis of the traditional forward isolation device

the field programmable gate array(FPGA)is adopted as isolation island to improve the transmission speed and reduce the error bit rate

the reverse penetrating threat is solved by the deep packet inspection technology

the security of human machine interface(HMI)management is improved by two factor authentication technology

the security of local management is improved by the encryption and authentication technology based on the state secret algorithm. Compared with the traditional forward isolation device

the performance and the security level of proposed device are both improved. Finally

the feasibility of the theory and the practicability of the technology are verified by project application.