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In order to solve the dynamic positioning problem of Manned Submersible Vehicle (MSV) in the uncertain marine environment,a linear active disturbance rejection control(LADRC) scheme which combines the linear extended state observer with the discrete second order steepest feedback control is proposed.According to kinetic theory, a manned submersible motion model of six degrees of freedom with currents is established,then the model is partially decoupled by using virtual control variables. Finally,system simulations of dynamic positioning with four degree of freedom is conducted by using MATLAB software. The simulation results show that this method can resist the strong currents interference rapidly and effectively and also meet the requirement of station keeping on high precision. 