The three low symptoms of depression are mainly depressed mood, slowed thinking and reduced volitional activity in clinical practice. The specific performance is: First, low mood. Patients show that they are not happy, depressed, no can make themselves happy, get up every morning and frown, painful worry how to spend the day, and feel painful for this. Second, slow thinking. Mainly manifested as a slow response to thinking, feeling like their brains hit glue, rust, understanding of the performance of the slower, more sluggish, non-responsive to some content. Third, the will activity is reduced. This symptom mainly involves no intention for the future life, especially in the long run, no cognition of the future, thinking that one day is one day in one’s current condition, and there is nothing for one to chase and pursue. The three low symptoms of depression patients are mainly manifested by these symptoms.