Alzheimer's disease (AD) is a common neurodegenerative disease and a kind of dementia in the elderly. More and more studies have shown that using the standardized extract of Ginkgo biloba leaves (labeled EGb761) to intervene in the clinical treatment of AD patients can effectively improve their brain neuron damage. Although its biological mechanism and principle are still being explored. Among all kinds of research, the three most widely studied directions of scholars are: (i) EGb761 can prevent Aβ (1-42) oligomer induced results (ii) It can show anti neuroinflammatory toxicity (iii) It can produce natural acetylcholinesterase (AChE) inhibitors. The three directions simply analyze how EGb761 has a specific impact on the patient's brain nervous system after entering the human body. Based on the review of the above three directions, this paper will briefly discuss and review the specific effects of EGb761 on the brain nervous system of AD patients.