Based on optical fiber surface plasma resonance sensor,the application of wavelet denoising with threshold for the SPR reflected spectrum is studied.At first,Gaussian white noise is added to the theoretical spectrum,and five kinds of mother wavelets,which are Daubechies9,Symlet7,Symletll,Symletl4 and Symletl5 are selected to reduce the noise. Comparing the resonant reflectivity and wavelength of SPR spectrum after denoising with that of the theoretical value,Symletll wavelets obtained the best performance.T...