The invention discloses a Chinese medicinal composition for treating tristimania, which is prepared into certain formulations by taking curcuma longa, St John's wort and ginseng as raw materials, and extracting and separating the raw materials by using 0-75 percent ethanol. An animal toxicity test result shows that 284 times of an adult dosage of the medicinal composition for lavaging a mouse causes no acute toxicity reactions; a pharmacodynamic study shows that the medicinal composition can significantly perform antagonism on acinesia and hypothermia, induced by reserpoid, of a tristimania model mouse, and can increase the number of autonomic activities and the dead time for tail suspension and swimming, induced by the tail suspension and forced swimming, of a desperate animal model. A clinical research result shows that by adopting a Hamilton rating scale for depression (HAMD) to evaluate the depression severity which serves as the primary therapeutic effect index, a treatment group obtains a significant curative effect, the effective rate is 92.3 percent, and compared with a control group, the medicinal composition has significant differences but has no toxic and side effects. The medicinal composition can be prepared into medically acceptable oral preparations, such as tablets, capsules (soft capsules or hard capsules), granules and the like; and the clinical curative effect and the pharmacodynamic study prove that the medicinal composition has the functions of smoothing the liver to alleviate mental depression and relieving mental stresses, and is an effective special medicament for treating the tristimania.