There was a study about school furniture. Students were photographed by automatic camera during a four-hour examination.  All of them were bent far over their tables in an unacceptable manner. The experiment was conducted to determine the perfect height pupils themselves preferred. There is no doubt that they preferred to sit much higher, which would automatically place them sitting straight and feel comfortable. Revise the design of school furniture, in a way, correcting the posture problem. According to the study, the height of table around half the person's height (80-90 cm for older pupils) and the chair around one-third the person's height (50-60 cm for older pupils) are the pleasant heights. What’s more, the table’s slope should match with the height of table and chair. When the seat’s  sloping forward 10-15 deg, and the forward sliding tendency counteracted by a small, fixed cushion, and when tabletop slope backward 10-15 deg, students will feel comfortable sitting.