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This paper presents an effective method for motion classification using the surface electromyographic (sEMG) signal collected from the forearm. Given the nonlinear and time-varying nature of EMG signal, the wave-let packet transform (WPT) is introduced to extract time-frequency joint information. Then the multi-class classi-fier based on the least squares support vector machine (LS-SVM) is constructed and verified in the various motion classification tasks. The results of contrastive experiments show that different motions can be identified with high accuracy by the presented method. Furthermore, compared with other classifiers with different features, the per-formance indicates the potential of the SVM techniques combined with WPT in motion classification.