As material characteristics of a bond layer directly affect the measurement accuracy of Fiber Bragg Grating(FBG) strain sensors, this paper simulates the impact of elastic modulus of the bond layer materials on strain transfer coefficient K according to the bond layer strain transfer model and the formula of strain transfer coefficient K under the premise of determining the structure size parameters. The results show that the strain transfer efficiency of metal is superior obviously to that of the organic adhesive.A contrast test is carried out. Test results indicate that the strain transfer coefficient K of the lead maintains a level of 0.98 while that of epoxy maintains about 0.90, and the former′s transfer efficiency has increased by 8.9% as compared with that of the latter.By replacing epoxy with the lead, it can greatly improve the strain measurement precision, and can more fully exert fiber optic sensors′ strain measurement ability.