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Al2O3:C optically stimulated luminescence dosimeter (OSLD) was prepared by liquid film forming method, and its dosimetric properties were studied. The results showed that the background was 0.03 mGy after annealing, the uniformity was better than 2%, and it had linear response with correlation coefficient R2=0.999 6 in the measurement range of 0.02 mGy-10 Gy, the difference between the response coefficients of β and γ ray was about 10%, the response coefficient of neutron was about 4%-7% of β and γ rays, the response signal of dosimeter had no obvious attenuation after multiple measurements, and the response changed by 5% in two months after exposure, which can be used for dose archiving and retesting in a certain period. The results show that the OSLD prepared by the liquid film forming method has good dosimetric properties, which prove the feasibility of the method.