According to the grating ends packaged struture, based on the principle of equivalence deformation, the strain transfer function was deduced, the change tendency of strain transfer efficiency with length and bond layer elastic modulus was simulated. Two FBGs were fixed to steel wire of ?7mm with epoxy and Zn, and the tensile tests were carried out, the test results showed: The linearity of tensile curves of two packaging type are above 0.99. The average strain sensing sensitivity of epoxy is 0.130 4 nm/KN, while the average strain sensing sensitivity of Zn was 0.142 6 nm/KN. Under various strain values, the strain transfer efficiency of epoxy is about 0.91, while the Strain transfer efficiency of Zn is about 0.995, the latter is nearly 9.34% more than the former. The test results are in accord well with numerical simulation results.