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To improve vehicle dynamic performance and vibration energy recovery ability,a kind of regenerative semi-active suspension with electro-hydrostatic actuator(EHA)was put forward.Based on the structure analyses of the semi-active suspension,the EHA mathematical model with hydraulic system and Energy recovery unit was established.The EHA prototype was designed and its test system was developed.The damping and regenerative characteristics of the semi-active suspension with EHA were studied by the bench tests and simulation analyses.The results show that the increasing of the motor external resistance will make the the damping force drop.However,increasing the external resistance can improve the energy recovery efficiency of the suspension.The experimental results are consistent with the results of the simulation,which shows that the EHA model established is correct.