The invention relates to a method for determining maturity grade of wide-area measurement and control technology. The wide-area measurement and control technology is divided into different maturity grades according to the theoretical research, test and application degree at home and abroad, so that during using, the input cost of each resource configuration in technology research and development, test, popularization and operation and the like in the construction process of a smart power grid can be determined according to the maturity grades of the wide-area measurement and control technology, work emphasis of each process can be made clear, resource allocation is optimized, and efficient construction of the smart power grid is promoted.