The invention relates to a method for determining the stroke design value of a landing gear buffer structure of a flying wing-configured aircraft and belongs to the technical field of aircraft landinggear design. The method comprises the steps of: 1, establishing a relational expression of stroke S of the landing gear structure of the flying wing-configured aircraft and sinking speed Vy of the aircraft; 2, establishing a calculation formula of the design landing sinking speed Vy of the flying wing-configured aircraft; and 3, obtaining a calculation formula of the stroke S of the landing gearstructure of the aircraft and the sinking speed Vy of the aircraft according to the relational expression established in the step 1 and the calculation formula established in the step 2. The method for determining the stroke design value, which is provided by the invention, has the advantages that only a small number of design parameters which are already determined in an overall developing schemein the initial design stage of the flying wing-configured aircraft are utilized; the calculation method is simple; the calculation principle is clear; and the stroke design value of the landing gearstructure of the flying wing-configured aircraft can be quickly obtained.