A method for processing a touch operation, comprising: acquiring, by a mobile terminal, a touch action of a user in a first sensing area, wherein the first sensing area is located in an area other than a display area of the mobile terminal; and when determining, by the mobile terminal, that the acquired touch action is a valid touch action, determining a function key corresponding to the valid touch action according to a correspondence between the touch action of the user acquired in the first sensing area and the function key, and performing a corresponding processing according to the determined function key; characterized in that: at least one identification line is arranged in the first sensing area; when the touch action is a sliding touch, the correspondence is a correspondence between a sliding trail corresponding to the touch action in the first sensing area and a function key; and the step of determining, by the mobile terminal, that the acquired touch action is a valid touch action comprises: determining, by the mobile terminal, the sliding trail corresponding to the touch action in the first sensing area; and when a location relation between a starting point and end point of the sliding trail and one of the at least one identification line in the first sensing area meets a defined location relation and the sliding trail passes through one of the at least one identification line a defined number of times during a defined time period, determining, by the mobile terminal, that the touch action is a valid touch action. acquiring, by a mobile terminal, a touch action of a user in a first sensing area, wherein the first sensing area is located in an area other than a display area of the mobile terminal; and when determining, by the mobile terminal, that the acquired touch action is a valid touch action, determining a function key corresponding to the valid touch action according to a correspondence between the touch action of the user acquired in the first sensing area and the function key, and performing a corresponding processing according to the determined function key; characterized in that: at least one identification line is arranged in the first sensing area; when the touch action is a sliding touch, the correspondence is a correspondence between a sliding trail corresponding to the touch action in the first sensing area and a function key; and the step of determining, by the mobile terminal, that the acquired touch action is a valid touch action comprises: determining, by the mobile terminal, the sliding trail corresponding to the touch action in the first sensing area; and when a location relation between a starting point and end point of the sliding trail and one of the at least one identification line in the first sensing area meets a defined location relation and the sliding trail passes through one of the at least one identification line a defined number of times during a defined time period, determining, by the mobile terminal, that the touch action is a valid touch action. at least one identification line is arranged in the first sensing area; when the touch action is a sliding touch, the correspondence is a correspondence between a sliding trail corresponding to the touch action in the first sensing area and a function key; and the step of determining, by the mobile terminal, that the acquired touch action is a valid touch action comprises: determining, by the mobile terminal, the sliding trail corresponding to the touch action in the first sensing area; and when a location relation between a starting point and end point of the sliding trail and one of the at least one identification line in the first sensing area meets a defined location relation and the sliding trail passes through one of the at least one identification line a defined number of times during a defined time period, determining, by the mobile terminal, that the touch action is a valid touch action. determining, by the mobile terminal, the sliding trail corresponding to the touch action in the first sensing area; and when a location relation between a starting point and end point of the sliding trail and one of the at least one identification line in the first sensing area meets a defined location relation and the sliding trail passes through one of the at least one identification line a defined number of times during a defined time period, determining, by the mobile terminal, that the touch action is a valid touch action.