So far, there is no research achievement of using the Autonomous decentralized control (ADC) technology to control the super high power motor of the electromagnetic aircraft launch system (EMALS). In this paper, we propose an autonomous decentralized system and algorithm for this control problem. We first analyse the architecture of the EMALS autonomous control model, then design a autonomous decentralized algorithm which is performed on the experimental model system. And we propose the fault-tolerance design. The experimental result shows that this method is effective for motor control, it's highly fault-tolerant and allowing the distributed power transmission which can reduce the power of the power source.