The application of IEC61850 promots relay protection information visualization. The feasibility of employing SDL (Specification and Description Language) into application of relay protection function sequence visualization is discussed from practical demands. Taking each function component as different states is also presented, as well as mapping information exchanging between different components into transition of different states compatible with EFSM (Extended Finite State Machine). On the basis, this target system is modeled by SDL, the sequence of every component action visualized dynamically through MSC (Message Sequence Chart) is achieved, thus protection function logic is visualized directly. Experiment system is constructed and sequence of distance protection is visualized preliminary. The result also shows that the proposal approach is feasible. In the end, problems such as information model, coordination design of hardware and software, etc. are analyzed and discussed.