Development stage division method for power grid

The invention provides a reliability-index-based development stage division method for a power grid, and belongs to the field of analysis and computation of a power system. The reliability-index-based development stage division method for the power grid comprises the following steps of: establishing a power grid data model for the simulation computation of the power system; determining a fault rate, a repair rate and failure clearing time; performing the simulation computation; and analyzing a simulation result. The method is simple and clear in concept, high in computability and wide in applicability; and the development stages of various specific power grids can be conveniently divided to guide the development planning of the power grids.