The invention discloses a relay protection on-line monitoring and analyzing system based on an EMS system. The relay protection on-line monitoring and analyzing system comprises a safety I zone, a safety II zone, and an integral platform providing uniform database, file service and message bus service for the system, wherein the safety I zone comprises a plurality of application servers and a plurality of acquisition servers at a scheduling terminal, I zone data communication gateway machine a station terminal, and a work station, and the safety II zone comprises a plurality of application servers and a plurality of acquisition servers at the scheduling terminal, a II zone data communication gateway machine at the station terminal and a work station. The I zone data communication gateway machine acquires protection professional use information and protection real time information from station terminals and sends to the I zone acquisition servers, and the II zone data communication gateway machine acquires fault oscilloscope information and sends to the II zone acquisition servers. Data communication between the safety I zone and the safety II zone is realized through a message bus. The work station comprises a human computer interface which allows a user to issue a data calling command. The functions of a conventional communication protection system can be improved.