NGF is an essential protiein in the growth and devolopment of sympathetic nerve and sensory nerve, it plays an important role in maintaining brain normal functions, adjusting internal secretion and immunity system. NGF is an idea treatment medicine in curing relative deseases related with neuropathic damage and neuropathic retrogression, such as, brain damnification, AD, brain fever, vascular neuropathic headache, Parkinson’s disease etc.