experience mode decomposition method (EMD transform), to be able to extract different time scales from sampled data sequence fluctuation curve, in order to achieve the purpose of time-frequency decomposition. This article is a major improvement for EMD transform, mainly reflected on the zero average line to calculate, it has no demand for upper and lower envelope, It compress the various pieces of data. It interpolates reach to the N points smoothly with a cubic spline, and as it for the zero average line. By this method the hierarchical mode decomposition is acquired. This paper also improves the Harr wavelet decomposition.
