The application of Morlet wavelet on profile retrieve of low coherence interferogram of optical fiber Fabry-Perot interferometer is studied and the formula for calculating the scale is provided.A series of simulations of profile retrieve under different signal noise ratios and the profile retrieve with experiment data are carried out.The results show the effectivity of Morlet wavelet.The loading experiment of optical fiber Fabry-Perot interferometer is performed,and the results processed with Morlet wavelet show that the measurement has good linearity with a correlation coefficient of 0.999 9.