The embodiment of the invention provides screen unlocking methods. The methods are applied to a touch display terminal. A plurality of first key regions are included on an unlocking interface when thetouch display terminal is in a to-be-unlocked state. A pressing operation of a user on one of the plurality of first key regions and a pressure value corresponding to the pressing operation are detected; a character in the first key region is used as a password character when the pressure value of the pressing operation on the first key region is in a preset interval; a sub-unlocking-interface corresponding to the first key region is popped when the pressure value of the pressing operation is in another preset interval, the sub-unlocking-interface includes a plurality of second key regions, and a character in a second key region is used as the password character; and the touch display terminal is unlocked when input password characters are the same as a preset password. The methods of theinvention effectively improve security of the touch display terminal.