Embedded FBG sensors can detect the internal state of stresses, temperatures and many other factors as an alternative to the other sensors. Before being embedded into the metal structures, FBG sensors must be protected by some metal materials. The discrepancy exists between the stress values recorded by FBG and the actual stresses. This paper relates the discrepancy to the two parameters that are the stress transfer coefficient and the location function. For a special connecting layer, the bigger elastic modulus and the smaller thickness of the protective layer, the bigger the stress transfer coefficient. When the FBG is embedded on the right of the designated position, the location function gets big with the increase of the tilt angle. When it is on the left of the designated position, the location function gets small with the increase of the tilt angle.