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For the complexity of calculating and analyzing the guided wave propagation and defect reflection in steel pipes, and the instructional role on studying the characters of T(0,1) mode guided wave to experimental studies, a method associating guided wave theory with numerical solution was applied to simulate T(0,1) mode guided wave propagation and defect reflection in steel pipes by building models, imposing surface loads, and calculating in the ANSYS program, and the characters of T(0,1) mode guided wave were studied. The results of numerical calculation prove that: the T(0,1)mode guided wave was basically non-dispersive in reasonable frequencies, the attenuation trend of amplitude was exponential and the amplitude was basically keeping stable after propagating some distance, the T(0,1) mode guide wave was sensitive to both inner and outer circumferential defects. The reflection coefficient of T(0,1) mode guided wave increases linearly with the increase of circumferential length and depth of defects. When defect depth is not through-thickness, axial length has more influence on reflection coefficient. When defect depth is through-thickness, the influence of axial length to reflection coefficient is basically omitted.