OBJECTIVE：To investigate the effect of memory and learning of Naokangtai capsule on AD rats.METHOD:Experimental model of Alzheimer′s disease was made with rats induced by intracranial injection of quinolinic Acid.RESULTS:Naokangtai capsule could increase the ability of memory and learning of AD rats,adjust the level of monoamine transmitters in the brain and hormones in the blood and improved electro-encephalogram of AD rats significantly.CONCLUSION:Naokangtai capsule possesses obvious effects of improving memory and learning of AD rats.