The invention discloses a method for carrying out signal lean analysis through a dynamic rule engine, and the method employs the dynamic rule engine and a power grid information processing system. The method is characterized in that the dynamic rule engine comprises a rule module, a mode matcher, and a rule execution engine, wherein the rule execution engine comprises a signal combination unit, a signal splitting unit, a signal statistics unit, a signal analysis preliminary result unit, a signal collaborative filtering unit, a signal loss inspection unit, and a signal analysis result unit. Compared with the method employed by a conventional power grid information management system, the method additionally employs the technology of the dynamic rule engine, so the method achieves the separation of business decision and application programs. When a business rule changes or there is a new demand, only preset business decision configuration needs to be used. The method can solve problems of abstract modeling and derivation rules of complex logic in signal analysis, and achieves the lean analysis of a signal of a power system.