Hot-wire anemometer is proposed based on a frosted fiber Bragg grating (FBG) coated with silver film assisted by a coupler of lumbar-enlarged optical fiber taper. The silver film adhered to the surface of frosted FBG absorbs pumping light, which is coupled into the fiber cladding by the lumbar-enlarged taper to generate heat. A strong diffuse reflection occurs on the surface of frosted FBG, which increases absorption of light by silver film. Center wavelength of frosted FBG changes with velocity of airflow according to a relationship. Experimental results reveal that sensitivity is 5.3 pm/mW and the measurement range from 0 to 20.36 m/s.

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