The invention relates to a three-state data-based interval-oriented multi-functional measuring and monitoring method, and belongs to the field of electrics. Steady-state, dynamic and transient data fusion is realized; aiming at the problem of single function of the existing measuring and controlling device of an intelligent substation, various functions such as measuring and controlling, a PMU (Phasor Measurement Unit), fault record and metering are integrated, the secondary electric (optical) cable length can be reduced, the secondary loop design can be optimized, the number of switches can be reduced, the land and the construction area can be reduced, and the investment can be saved; the method has great significance to promotion of integration of interval-oriented three-state data.