The invention relates to an electric power system fault positioning analysis method based on the RuLSIF change-point detection technology. The electric power system fault positioning analysis method comprises steps of defining a target data set according to power grid operation data, obtaining a different deviation vector function and a Pearson deviation maximum value on the basis of a RuLSIF algorithm, drawing a change-point detection fitting curve, determining a failed zone, combining with a system topology structure and determining a fault position and an affected range. The electric power system fault positioning analysis method based on the RuLSIT change-point detection technology realizes online analysis of the fault affected range and fast positioning, provides the accurate and effective evaluation basis for fast analyzing electric power system fault online and guarantees stable operation of the electric power system.