Psychological stress is an important factor causing a variety of psychosomatic diseases. Effective coping with psychological stress is the key to mental health. Existing studies show that mitochondria are the most sensitive organelles for psychological stress response. Psychological stress may leading to changes either in mitochondrial content per cell, or in mitochondrial functional capacity. Psychological stress mainly regulates each other by activating the HPA axis and neurosecretory factors. The purpose of this article is to show that before psychological stress has not caused serious damage of mitochondrial function and the imbalance of homeostatic, the scientific research personnel should be paid to the significance of changes in mitochondrial DNA copy number and its functional indicators. Therefore, the possibility of improving the mitochondria function as a targeted psychological stress intervention strategy is further explored to optimize the current research in the field of psychological stress.