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In order to improve the working frequency of electro-hydraulic exciters, an electro-hydraulic exciter based on differential hydraulic cylinder controlled by 2D valve was proposed, which could realize the change of hydraulic intrinsic frequency by controlling the volume of non-rod chamber. The scheme of electro-hydraulic exciter was analyzed and the mathematical model was set up. The simulation model was also constructed by the Simulink Toolbox of Matlab. The vibration waveform of exciter in low-frequency, middle-frequency and high-frequency were simulated. To verify the theoretical analysis and real vibration waveform of exciter, the electro-hydraulic exciter was designed and experimented. Results showed when the main part of the load constituted by the elastic force, the output waveform of exciter was prone to saturation under frequency of 5 Hz. With the increase of agitating frequency, the saturation disappeared. The resonance phenomenon would be occurred when the exciting frequency was equal to the intrinsic frequency of hydraulic system. The vibration amplitude would drop down rapidly after the resonance frequency. 