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With novel underwater wireless sensor array network architecture, the weighted least square (WLS) source localization method is developed. In this method, each sensor node is attached to a local sensor array which can estimated Signal-Noise-Ratio (SNR) as well the local direction-of-Arrival (DOA). Global localization can combined with estimated DOA selected by SNR. The target position can be fused by the coordinate relationship to form the linear equation set. Very promising simulation results demonstrated the feasibility of such a new approach for underwater wireless sensor network.