The embodiments of the disclosure provide a method for hand tracking. The method includes: obtaining, through a head-mounted device, a first image of a hand; determining, through the processor, a first pose of a first part of the hand based on the first image; obtaining, through a hand-held device, a second image of the hand; determining, through the processor, a second pose of a second part of the hand based on the second image, wherein the first part and the second part complementarily form an entirety of the hand; and determining, through the processor, a gesture of the hand based on the first pose and the second pose.