Abstract: When the load of the three-phase Vienna rectifier changes abruptly, the output voltage of the DC side will fluctuate. An improved beat free hybrid control strategy based on linear active disturbance rejection control is proposed. First, based on the mathematical model of the three-phase Vienna rectifier, an improved beat free control algorithm is introduced into the current inner loop to postpone the predicted current to k+2, so as to eliminate the current harmonics on the network side and achieve accurate tracking and control of the current on the network side, reduce the total harmonic distortion rate of system grid-side current from 4.33% to 2.06%. Secondly, linear active disturbance rejection control is introduced into the voltage outer loop, and the model parameter change is regarded as the internal disturbance of the system, and the disturbance is estimated and compensated by LESO in real time, which solves the problem of excessive DC output voltage fluctuation under the load sudden change condition. Finally, the proposed hybrid control strategy is verified by building a simulation model of Vienna rectifier and a 10 kW experimental prototype. The simulation and experimental results show that the proposed hybrid control strategy has better steady state and dynamic performance in the scenarios of system start-up with load and load change.