The physical characteristics of the light polarization and the fluorescence in human cerebrospinal fluid for the normal and un-normal cranial nerve centre system are shown in this paper. There is a very strong Raman band at Raman shift 3392cm

-1

in the spectrum of human cerebrospinal fluid

originating from the vibration of O-H bond

with polarizing rate P

OH

= 0. It is given that the vibration of O-H bond in human cerebrospinal fluid is completely symmetrical

and its polarizint intensity is isotropic.The polarizing rate of the fluorescence in normal and un-normal human cerebrospinal fluid are 0.69 and 0.74

respectively

thus it is proved that the molecule symmetry would be reduced when haman cranial neive centre system is out of order. Included angle10°31'10'' is estimated from the polarizing rate of the fluorescence measured.We have measured the lifetime of the fluorescence 5450Å in the normal and non normal human cerebrospinal fluid

they are both 8ns.Besides

the relation of the intensity-time of the fluorescence 5450Å are measured at 4880Å radiation for the samples of the normal and un-normal human cerebrospinal fluid. The curves(see Fig.2)

will gradually approach a constant with time. We can obtain some good enlightements from those results -human vertebra end radiated by suitable wavelength of laser for curing some diseases of human cranical nerve centre system.