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Extended equal area criterion method (EEAC) is always applied for transient stability analysis of large scale power system. The coherency identification of generators clusters after accidents is on the basis of EEAC Method, and the coherency identification of generators clusters used to take the complex power angle method as the criterion, which consume a lot of time and possess a relatively inefficient. A new approach to the coherency identification of generators clusters based on wide area measurement system is proposed in this paper, which utilize the ratio of accelerated kinetic energy to distribute the critical machines clusters. The concept of the ratio of accelerated kinetic energy and related algorithm are described in detail in this paper. Take the power grid of He Bei province in China as a calculation example to illustrate the feasibility and advancement of this approach.