Abstract:propellant refueling simulator for flight control is a simulation system used to validate the flight program and ground control schemes,to train mission operators,constructing a realistic mission environment for system testing in the flight control center. A design of flight control simulator used in the preparation of propellant refueling mission is put forward, the system structure and principle are introduced in detail, the system information flows and the soft design are showed, the technical difficulties and the solutions are illuminated at last. this design brings the simulator high comparability, high universality and high agility, and can simulate the propellant refueling process dynamically, it has been applied to the preparation of the first propellant refueling mission in our country, and good results have been achieved.