Region judgment control method and system for touch screen

The invention discloses a region judgment control method and a system for a touch screen. The method comprises the steps as follows: S1, setting an appointed region of the touch screen as an effective region; S2, judging if a touch point is in the set region, if so, carrying out the step S3, and if not, shielding the touch operation; and S3, judging if the touch operation is valid by judging if a press-down coordinate and a release coordinate are in the effective region; and only when both the press-down return coordinate and the release return coordinate generated by the press-down and release actions of a user are in the effective region, making a response and performing a corresponding operation by a touch system, and otherwise, shielding the touch operation. When the touch screen is clicked by the user, both the press-down coordinate and the release coordinate generated by the press-down and release actions are judged, so that the situation that the clicking position is valid and the release position is i