The linearized inverse methods based on the Born and Kirchhoff approximations havebeen investigated to reconstruct the shape of flaws with scattered waveforms in the relatively low frequency range. On the other hand, the SAFT is known as a flaw imaging technique based on the time of flight strategy with reflected echoes. Here the combined method of the SAFT and linearized inverse methods is proposed for a flaw imaging technique in infrastructures. The rough location of flaws is detected first by the SAFT, and then the exact flawshape is reconstructed by the linearized inverse methods. To show the practical use of thismethod, the shape reconstructions of flaws in an elastic material with flat surfaces are demonstrated by the measured ultrasonic wave.