The waviness is a visual effect produced by the change of the physical curvature of the surface of the product, when the external parallel light isincidentified, resulting in a change of the light reflected into the human eye. After multiple folds, there will be different degrees of crease conditions in the folded area of the flexible display panel. At present, the 3D profile characterization is mainly used to evaluate the depth or width of waviness, but there are differences between the human eye's perception and the depth of the waviness. In order to accurately monitorthe different degrees of the waviness, a method is studied to simulate the evaluation scheme of the human eye's perception of the crease: The inplane brightness tester is used to measure the optical topography of the crease surface, and the severity of the crease is evaluated by the brightness difference in the crease area, which is consistent with the subjective observation by the human eye and the 3D profile results.