The content of GABA, glycine and taurine in cortex, cerebellum and basilar nucleus of hamster living in the magnetic free field space was determined in different time. The change of three neurotransmitters is not distinct with the lapse of time in cortex. The GABA was decreased gradually in cerebellum and basilar nucleus and the taurine was increaced in cerebellum after a month. This change is similar with that of corresponding area in the brain of some kinds of neuropathes.