Pedals, known as "foot beds" or "treadmills" in ancient times, are small pieces of furniture that people put in front of their seats to support their feet. Since the Song and Yuan Dynasties, it has often been combined with thrones, big chairs and beds, and some of them are connected with furniture itself, such as pedals and chairs of chairs. Others are made separately, such as the pedals and beds of the throne.

Besides stepping on the bed or sitting, the pedal also has the function of holding the feet. Generally, the seat surface of the throne or big chair is higher than the height of a person's calf, so sitting in a chair will inevitably hang your feet. If a footstool is provided, you can put your legs and feet on the footstool to achieve the purpose of comfort.