The surface-mounted fiber Bragg grating sensor measurement system includes three parts: optical fiber, intermediate layer and matrix. However, due to the mismatch of mechanical properties and thermodynamic properties of the three, the strain of the matrix cannot be completely transferred to the fiber, and there is a strain transfer rate between the two. The influencing factors of strain transmissibility are summarized, and the strain correction equation is given for the application scenarios in the variable temperature environment.