Simplify the wing to Euler–Bernoulli beam, Taking strain as the basic independent variable, a governing equation of beam bending deformation is established. The approximate interpolation solution of the strain distribution curve is obtained by measuring the strain on the beam surface. According to the physical conditions, the boundary conditions of each deformation curve are determined, and the bending deformation function model of the whole beam is established. According to the model, the deformation curve of the wing under any load can be calculated. It provides a new method for the measurement of wing configuration changes in static test and flight test. Finally, The new method is compared with the analytical method and the measurement results of the static test of the whole machine. The results show that the accuracy of the new method can meet the needs of engineering calculation and can be used in relevant tests.