The invention discloses a criterion for combining local electrical amount with relevant line parameters to accurately measure the position of an oscillation center and measure the position of a system desynchronizing oscillation center based on in-situ electrical amount. The popularization and application of the criterion for measuring the position of a system desynchronizing oscillation center based on in-situ electrical amount can realize in-situ, safe and reliable power system desynchronizing stepout control with quick action and definite action scope by combining reliable stepout criterion and realize the cooperative control of multiple sets of desynchronizing stepout devices by automatically adapting different power network running modes.