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This paper proposes a decentralized coordinated scheme based on multi-agent structure by using wide-area measurements signals for the development of transient stability in large power system. First, the wide-area signal based state feedback decentralized coordinated controller is designed to enhance transient performance. Besides, intelligent agents are designed to have the capability of making an exact judgment for the stability of global system after the system has been suffered various disturbances. Then, modified equal area criterion (EAC) is employed for the transient stability evaluation of large systems in order to draft the rule of coordinated agent's start-up. Taking into account the time delays in wide area transmission and the impact from coupling among multi-machine and uncertainties, another task of this paper is to propose H∞ control method based on linearization interconnected model in the global power system stabilizer (GPSS). And the H∞ control problem is parameterized to linear matrix inequality (LMI) problem so as to solve feedback controller parameters. Finally, simulation studies on a multi-machine system demonstrate the effectiveness of the control scheme.