Glucocorticoid hormones affect the aspects of the formation of long-time memory distinctly, and a number of studies indicate that glucocorticoid can enhance memory consolidation. Considerable evidence both in human and animals reveals that glucocorticoid hormones enhance the consolidation of memory through interactions with the noradrenergic system of the basolateral complex of the amygdala(BLA). The amygdala, when activated, influences a variety of other brain structures, including the hippocampus, nucleus accumbens and caudate nucleus, then modulate memory consolidation. Glutamic acid, endocannabinoids and their recepters are also involved in the neural mechanism indicated by recent researches. According to recent studies, the effects on stress reaction are different among the anaesthetic .