For the elastic deformation reconstruction of the 3-D frame structure, this paper proposes a measurement strain correction method to solve the strain measurement error problem. The transformation relationship between the surface strain and the deformation of measurement points is derived by the inverse finite element method. The measured deformation values are substituted into the transformation relationship to obtain the corresponding inverse solution of strain. According to the strain measurement error introduced by the installation of the framework model and measuring operation, the nonlinear relationship between the measured strain and inverse strain of the corresponding measurement point is difficult to get. Based on the fuzzy network (FN) with universal approximation ability for arbitrarily functional relation, the FN is attempted to approach this unknown relationship. After the fuzzy network is fixed, the measured strain is modified by the network. The deformation of framework structure is determined by using the modified strain. Finally, the accuracy of the method is verified by conducting the experiment on the 3-D frame structure. The results show that the error of deformation reconstruction generally decreases by more than 60%. This also illustrates that the measured strain modification method can improve the accuracy of deformation reconstruction effectively.