A fiber optic airflow sensor based on fiber grating array is proposed.The length of the gate region of the single-mode fiber grating is 10 mm,and the three fiber gratings are evenly distributed around the silica gel substrate.The changes of the ambient temperature and flow velocity can cause changes in the reflectance spectrum of the sensor.By monitoring the reflectance spectrum,the physical quantity of the outside can be measured.Experimental analysis shows that the silica gel matrix has a good coupling effect with the fiber grating.By changing the length of the silica matrix,the sensing characteristics of the sensor are effectively improved.The experimental results show that under normal room temperature conditions,the sensor′s central wavelength drift is quadratic with the flow velocity and the sensor has directional sensing characteristics.The fiber array airflow sensor proposed in this paper is compact in structure,simple in manufacturing process and with high reliability.