While maintaining the original design structure as unchanged as possible, the transport aircraft can achieve the rapid range extension in the short term by adding auxiliary fuel tanks, in order to achieve the design goals of large range and long flight time. At the same time, it can serve as a modification platform for multiple types of special aircraft subsequently. Since the auxiliary fuel system does not supply fuel directly to the engine, but transfers fuel to the basic fuel tank during the cruise phase. As the result in the early stage of the design of the auxiliary fuel tank system for transport aircraft, it is necessary to determine the transfer parameters and transfer parameters and strategies from the auxiliary fuel tank to the basic fuel tank as early as possible, in order to use them as inputs to carry out trade-offs and multiple iterations of the system architecture. Reference to the existing experience in the design and engineering of transport aircraft and through the comparative analysis of different trade-off schemes, the fuel transfer rate and related strategy under the condition of the current maximum design fuel capacity of the auxiliary fuel tank of a certain type of aircraft were given in this paper, and the influence of the change of the maximum fuel capacity on the analysis results was also considered. In addition, the analysis methods here have certain reference for the design of other aircraft auxiliary fuel system.