Generally， the distributed transient simulations among different dispatching centers are carried out in the wide area networks. To overcome the high-latency of remote data exchanges， the communication number for the distributed transient simulation should be reduced as much as possible. In this paper， a new algorithm for the distributed transient simulation is proposed based on the inverse Broyden quasi Newton iteration method. An interconnected power system is firstly decomposed into several sub-areas using nodal decomposition method. Then， the inverse Broyden quasi Newton method is used to solve the implicit boundary equations. This is equivalent to performing the transient simulation of the overall system in a decomposed and coordinated manner. Test results of the IEEE 39-bus system and a practical power system， the Northeast-North-Center power system of China， prove that the proposed algorithm has better convergence speed and accuracy. It can realize the real-time simulation of huge interconnected power systems in the high-latency wide area networks， which makes it suitable for industrial applications.