Method and system for achieving switch function of touch screen of mobile terminal

The invention discloses a method and system for achieving the switch function of a touch screen of a mobile terminal. The method includes the steps that when the mobile terminal is detected to be in a calling state, a large-area touch function of the touch screen of the mobile terminal and driving of virtual Psensor equipment are started; the large-area touch function is used for judging whether an approaching state of the touch screen of the mobile terminal is changed or not, if yes, the virtual Psensor equipment is used for recording the value of a zone bit PS used for showing the current approaching state, driving of the virtual Psensor equipment is used for obtaining the value of the zone bit PS, and the value of the zone bit PS is transmitted to an upper layer; the upper layer is used for achieving the switch function of the touch screen according to the value of the zone bit PS.