In existed methods of flow field reconstruction based on ultrasonic tomography

it can only reconstruct transverse flow field distribution or axial flow field distribution at a time. To get the information of both transverse flow field and axial flow field at the same time

a new method is proposed. By reasonable arrangement of ultrasonic transducers around circular pipe and using the simultaneous algebraic reconstruction technique（ SART）

transverse and axial flow fields can be reconstructed simultaneously to get reconstructed three-dimensional flow field. It shows that the new method is reliable as the transverse and axial flow field are reconstructed successfully in the reconstruction experiment with practical single-bend pipe experiment.