A new temperature compensation method of fiber Bragg grating was put forward and experimentally demonstrated based on side polished fiber Bragg grating overlaid with polymer with negative thermo-optic coefficient. Experimental results show that the new method provides a good temperature compensation for fiber Bragg grating. Temperature sensitivity of the fiber Bragg grating packaged by polymer with negative thermo-optic coefficient is reduced to 1/16 of that of fiber Bragg grating without compensation in the range of 63 ℃ to 79 ℃; and to 1/4 in the range of 58 ℃ to 101 ℃. The new device of fiber Bragg grating packaged for the temperature compensation has a diameter of 2mm and length of 20 mm.