In the present work, a novel experiment for the flexible piezoelectric system was introduced. The flexible piezoelectric film was spontaneously in contact with the soft substrate conformably. After driven by the pure electrical load, the delamination between the film substrate systems can be observed visually. By thoroughly analyzing and eliminating the influence of gravity, the “force” that prevents the delamination points to the effect of surface energy. Apparently, the deformation of the flexible film is quite small, and a linear constitutive model still dominates the mechanics of the system in this scenario. Moreover, different from the traditional piezoelectric system, the Maxwell stress cannot be neglected in the current experiment. A simple mechanics model is derived in this study to reveal the mechanism behind the experiment.