The sole note is a regular cyclical signal. The best frequency domain resolution can be gotten with FFT. However, the harmonic components of the note are extremely rich, so FFT is unable to examine the fundamental frequency accurately. DWT can decompose the signal to low pass rapidly,and has a smooth low frequency approximation. This article brings forward DWT and FFT union musical note recognition method, which realizes the precise frequency recognition of the musical note and is an expected method.