The chalcogenide glasses of Ge₃₃As₁₂Se₅₅ and Ge₂₂As₂₀Se₅₈ were prepared by vacuum melting quenching method.The test results show that the glasses have wide transmission window expanded to the mid-infrared region,high refractive index and high refractive index temperature coefficient.Based on this material,chalcogenide fiber grating temperature sens ors which can be used in the mid-infrared band were designed.By using the transfer matrix method and th e coupling mode equation,we did numerical simulation on the transmission spectrum and temperatu re sensing characteristics of the Ge-As-Se fiber grating.It is found that the center wav elength drift of the designed fiber Bragg grating (FBG) temperature sensor has a good linear relationship with the temperature changes.When the working wavelength moves from near infrared to the mid-infrared band,the fiber grating temperature sensing sensitivity can be greatly improved.The results show that the sensitivities of G e-As-Se FBG and long-period fiber grating at 1.55μm is up to 0.1232nm/℃ and 0.292nm/℃,respectively,which are approximately 10and 24times higher than that of silica FBG and long-period fi ber grating at 1.55μm.