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The principle of large scale expendable liquid rocket engine thrust closed-loop control was proposed and tested. This part is critical to the liquid rocket propulsion control system. Firstly, the real-time dynamic model was set up here, based on this model we got the linear model at the design point . Secondly, the root locus method was used to design the controller, then the simulation of real-time dynamic model combined with the controller was carried out. At last, the hardware-in-the -loop platform containing software and hardware was set up for the engine control. The results show that the controller and the platform work well and easy to operate.