The door pair is a brick and wood carving structure above or on both sides of the door frame. The typical style is round short columns, about one foot long, perpendicular to the doorframe and parallel to the ground, all of which are even, or two pairs, or four pairs, or even more. They were originally used as decorations. In ancient times, the size and number of households often showed the dignity of this family, which was generally proportional to the size of official property. The number of official positions is more than five, usually six, and the number of official positions below six or seven is mostly four, only two, and ordinary big families can also set up two pairs to show their identity and status.
In the traditional aesthetic concept of China people, harmonious beauty is a factor that cannot be ignored. Door-to-door and door-to-door are two inseparable architectural shapes in traditional folk houses. A house with doors must have doors. Slowly, door-to-door and door-to-door are often combined and gradually evolved into a complete term. And because both of them are symbols of family identity and status, people often describe them as two families with the same marriage conditions that are suitable for marriage.