A method for resizing a selected region of a preview interface, applied to a touch screen terminal having a photographing function, comprising: after the photographing function of the terminal is enabled and the preview interface is displayed on a touch screen, detecting a first touch operation of a user for determining a designated region on the preview interface; after the first touch operation of the user for determining the designated region on the preview interface is detected, enlarging a display content of the designated region according to a preset proportion; and displaying the enlarged display content of the designated region on the touch screen as an enlarged designated region, characterised in that after displaying the enlarged display content of the designated region on the touch screen, the method further comprises: detecting whether there is a second touch operation on an edge of the enlarged designated region; and, if yes, further enlarging or reducing the designated region according to a displacement trajectory of the touch operation; detecting whether there is a third touch operation within the enlarged designated region comprising a number of press-down operations and lift-up operations for a pre-set period of time; if yes, determining a type of the third touch operation to be an enlarging operation or a reducing operation according to the number of press-down operations and consequently further enlarging or reducing the designated region by a pre-set coefficient according to the type of the third touch operation; and detecting whether there is a fourth touch operation outside the enlarged designated region, and, if yes, recovering the preview interface on the touch screen to the original interface. after the photographing function of the terminal is enabled and the preview interface is displayed on a touch screen, detecting a first touch operation of a user for determining a designated region on the preview interface; after the first touch operation of the user for determining the designated region on the preview interface is detected, enlarging a display content of the designated region according to a preset proportion; and displaying the enlarged display content of the designated region on the touch screen as an enlarged designated region, characterised in that after displaying the enlarged display content of the designated region on the touch screen, the method further comprises: detecting whether there is a second touch operation on an edge of the enlarged designated region; and, if yes, further enlarging or reducing the designated region according to a displacement trajectory of the touch operation; detecting whether there is a third touch operation within the enlarged designated region comprising a number of press-down operations and lift-up operations for a pre-set period of time; if yes, determining a type of the third touch operation to be an enlarging operation or a reducing operation according to the number of press-down operations and consequently further enlarging or reducing the designated region by a pre-set coefficient according to the type of the third touch operation; and detecting whether there is a fourth touch operation outside the enlarged designated region, and, if yes, recovering the preview interface on the touch screen to the original interface. detecting whether there is a second touch operation on an edge of the enlarged designated region; and, if yes, further enlarging or reducing the designated region according to a displacement trajectory of the touch operation; detecting whether there is a third touch operation within the enlarged designated region comprising a number of press-down operations and lift-up operations for a pre-set period of time; if yes, determining a type of the third touch operation to be an enlarging operation or a reducing operation according to the number of press-down operations and consequently further enlarging or reducing the designated region by a pre-set coefficient according to the type of the third touch operation; and detecting whether there is a fourth touch operation outside the enlarged designated region, and, if yes, recovering the preview interface on the touch screen to the original interface.