Phased array ultrasonic velocity profiler (PAUVP) method is presented. Since UVP is applied to various kind of flows, ultrasonic transducer should be design accordingly depending on the flow configuration. Therefore, procedures to design and evaluate phased array transducer is firstly presented. Vector reconstruction technique is then described, which employs differences of Doppler frequencies analyzed in the transducer array. Measurement accuracy of PAUVP system is evaluated using horizontal pipe flow. Estimation accuracies of both angle and magnitude of velocity vector are confirmed by comparing flow direction and numerical simulation data, respectively. Finally, measurement in a water tank is demonstrated, which shows the applicability of PAUVP to visualize two-dimensional velocity vector in fluid flow.