An unlocking method and a terminal device using the same are provided. The method includes: collecting a signal at an edge of a touch screen of the terminal device; judging whether the terminal device is held by a user according to the collected signal; and if the terminal device is held by the user and the terminal device is in a sleeping mode, unlocking the terminal device. The method allows the user to unlock the terminal device after holding the terminal device, which improves the convenience and the intelligence of unlocking by the user.