Generally, there are desks of various sizes, including single desks and double desks. Generally, the size of a single desk is 75cm×30cm, and that of a double desk is 75cm×200cm. If practicality and chairs are considered, the height of the desk should be 750 to 80 mm according to normal human physiology. Considering the activity area with legs under the table, the clear height under the table should not be less than 580 mm, and the chair should be soft and comfortable.