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The digital signal-obtaining for gyroscope is given. The single optic-fiber sensor via modulating intensity of light is used as measuring component . The influence on static transmission properties resulting from the special working environment (e.g. cryogenic and vacuum) ,the measure error because of the reflector shape of rotor,the abnormity of facula from sensor caused by the existence of engraving error,and the fixing error of sensor and the error of machine tools initial lignment are investigated. The mathematic model in every condition is founded, the simulation and relative experiments are done and the outcome is analyzed. The mathematic model and method of compensating technology are studied and some relative experiments are made. The result of study is useful to improvement of the signal-obtaining system.