In　order　to　improve　the　signal-to-noise　ratio　and　the　effectiveness　of　noise　reduction,　a　redundant　second　generation　wavelet　transform　based　on　interpolation　principle　was　constructed.　This　method　does　not　mesh　in　the　process　of　decomposition,　which　the　approximation　signal　and　the　detail　signal　have　the　same　length　with　the　original　signal,　so　the　amount　of　data　is　doubled　the　original　signal.　Data　redundancy　characteristics　of　the　method　has　a　good　result　of　the　analysis.　Compared　to　the　traditional　wavelet　transform　and　the　second-generation　wavelet　transform,　the　redundancy　of　the　second　generation　wavelet　transform　is　more　effective.