Metal bonding layer seriously affects the strain transfer performance of fiber Bragg grating(FBG). Based on the model of strain transfer of FBG,the effects of the length,the th ickness,Poisson′s ratio,elasticity modulus of bonding layer on the strain transfer coefficient of FBG are analyzed by numerical simulation.The results show that the metal bonding layer has a larger advantage than the epoxy glue layer in strain transfer performance.The strain transfer coefficient increases with the length of metal bonding layer,decreases with the thickness of metal bonding layer and the influence of Poisson′s ratio can be ignored.The FBG is packaged to steel wire using the metal bonding technology.The tensile tests under differ ent bonding lengths and elasticity moduluses are carried out.The results indicate that the strain transfer coe fficients of FBGs are 0.948,0.962and the average strain sensitivities are 1.076pm/με,1.099pm/με when the metal bond ing layer is zinc,whose length is 15mm,20mm,respectively.The strain transfer coefficient of the FBG package d by metal bonding layer is enhanced by 8.9% compared with the epoxy glue packag ed one.The experiment result is general agr eement with the analysis and provides guidance for metal package of FBG.