Abstract: In order to determine the key parameters of the radish harvester vibration breakshovel, the scarification experiment was conducted by using the eccentric link vibration device. The two times orthogonal rotational regressive tests were designed in the experiment that harvester walking velocity, frequency, amplitude, inclination angle, in-soil angle of vibration breakshovel as input parameters and soil porosity as output parameters were defined and soil porosity were defined as output parameters. The regression mathematics models between output parameters and input parameters were established and then parameters were optimized through Design-Expert 6.0. The optimal combination that harvester walking velocity was 0.64?m/s, frequency of vibration breakshovel was 2 Hz, amplitude of vibration breakshovel was 14.38?mm, inclination angle of vibration breakshovel was 25.72°, in-soil angle of vibration breakshovel was 39.68° was determined, at that time the soil porosity was 50%-60%. The basis is provided for researching and designing the radish harvester.