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spinal cord injury(SCI)brings great negative influence to the patients and society.Neurological loss in human after SCI is a major challenge in clinical.neural regeneration make important role after injury.such regeneration including neural structure and function plasticity reconstruction.some study have showed that used sample entropy as an indicator of nonlinear dynamical in the brain to quantify plasticity changes in spontaneous EEG recordings of rats before and after SCI.and primarily study results show the correlations of sample entropy values and behavioral evaluation scores.So we do experiments to use sample entropy analysis for the evaluation of neural plasticity in patients in SCI.