A detection method for detecting ripples of a touch screen, and a detection plate and a detection assembly used in the method are disclosed by embodiments of the present invention, the detection method comprising steps of: manufacturing a detection plate, one surface of which is provided with a plurality of grids arranged in a regular array, which grids are formed by intersecting a plurality of grid lines extending in a first direction and a plurality of grid lines extending in a second direction; placing the surface of the detection plate at a predetermined angle with respect to a surface of one side of the touch screen where the a glass plate is located, such that the grid lines on the detection plate are imaged on the touch screen; and observing grid lines imaged on the touch screen, and determining the existence of ripples at a position of the touch screen corresponding to a curved portion of the imaged grid lines in case of the curved portion of the imaged grid lines. According to the embodiments of the invention, conditions of the ripples on the touch screen can be determined intuitively and easily according to curved conditions of the grid lines imaged on the touch screen, by imaging the grid lines on the detection plate onto the touch screen, such that the accuracy of detection is enhanced.