A method of controlling a touch screen of an electronic device includes the following steps: switching the touch screen from a normal state into a shrunk state; and confining a touch interactive region of the touch screen to a sub-region of the touch screen and positioning a non-interactive region of the touch screen away from an edge of the touch screen to be partially covered by a finger performing an operation when the touch screen is in the shrunk state. The touch interactive region is a region within which the touch screen displays an interactive frame, and when the touch screen is in the normal state, the touch interactive region extends beyond the sub-region.