To solve the problem that nodes move with ocean currents in underwater wireless sensor networks（ UWSNs）

a real-time localization algorithm based on current model（ RTLC） is proposed. Using current model to represent mobility model of nodes eliminates the influence of fluidity on positioning and the speed of nodes underwater is simulated precisely. The mobility model is optimized by Kalman prediction combined observed values with theoretical values. Besides these

the recording and updating mechanism ensure information efficiency

so as to increase positioning accuracy. The simulation analysis shows that the performance of RTLC algorithm is prior to scalable localization with mobility prediction（ SLMP） algorithm with low communication costs

high localization coverage rate and average positioning error.