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9.5%。For an electro-hydraulic vibration exciter with a 2D valve, the frequency and the amplitude of the excited waveforms are separately controlled by rotary motion and sliding motion of valve core, respectively. Based on the work principle of the an electro-hydraulic vibration system, the mathematical model of an exciter was established. The equations of excited waveforms were solved by using the subsection integration method, and the real excited waveforms were obtained to validate the theoretical analysis result. The corresponding spectrum analysis and the distortion calculation were executed. The results reveal that in low frequency section, the ascent and descent slopes of excited waves demonstrated somewhat asymmetrical because of the changing direction of the elastic load. The extent of asymmetry depends on the axial opening of 2D valve. The waveform distortion is not greater than 9.5% as long as the linear opening of 2D valve is below a critical point. 