The vestibule is a part of the inner ear that coordinates the body’s balance. The inner ear, also known as the labyrinth, can be divided into three parts: the vestibule, the semicircular canals and the cochlea according to its anatomy and function. In terms of organization, it can be divided into bone labyrinth and membrane labyrinth. The vestibule belongs to an oval cavity between the semicircular canals and the cochlea and is located in the osseous labyrinth, including the oval capsule and the balloon. While the inner ear mainly plays a role in sound perception and balance, the vestibule mainly maintains balance and also regulates reflexes. In particular, when the head position changes, linear motion is controlled by the elliptic capsule and the balloon, and rotational motion is maintained by the semicircular canals. The inner ear can be selected for pure tone hearing threshold, acoustic conductance, auditory brainstem response, temporal bone CT or MRI. Vestibular function can be examined with balance function, nystagmography and other related tests.