Depression is a common mental disorder, and there is no clear fear of the three colors when personal preferences are excluded. However, colors can indeed affect a person’s mood, therefore, for depressed patients, long-term exposure to red, black and blue objects is not recommended. 1. Red: Red is mostly considered a color that brings excitement, enthusiasm, anger and other overwhelming emotions, and depressed patients with too much exposure may experience negative results such as anxiety, physical and mental stress, and even feel exhausted. 2. Black. Depressed patients often prefer black, a relatively dark color, but black often brings negative psychological impact and may aggravate the depressed state of mind of depressed patients. Therefore, it is not recommended that too many black items in the home environment, depressed patients should also avoid long-term dark environment; 3, blue: according to color psychology shows that blue often carries the symbolism of melancholy, pessimism, in long-term exposure, may bring unhealthy psychological implication to depressed patients, which has a negative impact on the recovery of the disease. Depressed patients can be more exposed to some orange, yellow or pink, and appropriate placement of these warm colors in the home environment, for the patient’s mood may have a relaxing effect.