Abstract: A fiber Bragg grating (FBG) is inscribed in hydrogensensitized polarization maintaining fiber with a peak wavelength of 1300nm. The temperature sensing characteristics of this polarization maintaining fiber grating were experimentally studied and theoretically analyzed. The result shows that this kind of fiber grating can be used as a temperature sensor for temperature measurement. Since the polarization maintaining fiber grating has a fine linear relationship with temperature, it can replace the singlemode fiber grating and decrease the fabrication cost. This experiment result can be taken as a reference for further study on the polarization maintaining fiber grating.