The invention relates to a method for achieving quick screen blacking and locking of a mobile terminal by long press of a touch screen. An induction area is formed on a touch screen of the mobile terminal to serve as the trigger area of the screen blacking and locking function, and the induction area is defined to be a screen blacking and locking functional area. The method comprises the steps that the mobile terminal acquires the finger movement, on the touch screen, of a user when the screen is light for a time period stored in a storage, wherein at least one continuous touch area is formed on the touch screen by the finger movement, and each continuous touch area is defined to be a data point; whether at least one data point is located in the screen blacking and locking functional area is judged, and whether the area of at least one of the data points in the screen blacking and locking functional area accords with the trigger area threshold in the storage is judged; whether the location moving amplitudes of all the acquired data points accord with the moving amplitude threshold in the storage is judged, and the mobile terminal is made to be in the screen blacking and locking state.