Based on the actual influence of optical fiber coil received the thermal stress, optical fiber′s crushing stress birefringence in fiber coil is deduced, and the method is proposed, making use of the finite element transient state thermal analysis, to study thermal stress interference birefringence of fiber coil influenced by coating adhesive. Via the simulation computation to the thermal stress disturbance birefringence of typical fiber, the paper concluded that after coating adhesive processing, the fiber coil has a temperature segment that relates to the adhesive parameter, and the thermal stress disturbance birefringence in this segment is smallest, even the sensitivity of temperature change drops to the lowest. Through an actual test to 1000 m polarization maintaining fiber coil, it is indicated that the extinction ratio in this segment is 1.5 dB higher than low temperature section. The match of adhesive material′s temperature characteristic for environment of fiber optic gyroscope is proposed.