With the rapid development of economy and lives, people suffer from more and more chronical stress than before. Stress may affect cognitive function in brain,and even cause a depressive disorder, including impaired learning memory, depression, dysmnesia and so on. However, the pathogenesis remains unclear. Present study shows that it may result from neurotransmitter disorders, free radical damage, neuronal apoptosis, immune system suppression and other factors. Recently, the usage of traditional herbs has p...