In addition to the influence of color on psychology and emotion, the visual sense also has a great impact on the spatial effect of architectural decoration environment: ① produce a sense of distance: objects with high lightness feel close, and objects with low lightness feel far. If red and yellow are used together, they are often used in palaces and temples. Due to the different sense of distance, they also have a concave convex sense, which plays an important and prominent role, such as the Forbidden City. ② Create a sense of volume: the space with high lightness makes us feel stretched and empty, while the space with low lightness makes us feel depressed and contracted. For example, we often use light color (high brightness) to decorate the space, which can increase the light and brightness, making the space feel larger; Otherwise, the contraction becomes smaller. ③ Produce warm and cold feeling: the warm tone makes people feel warm and cordial, while the cold tone makes people calm and serene. Under different environmental conditions, the use of different tones makes people have different reactions to the environment