M-type stars play a significant role in the study of star evolution.The LAMOST project

the largest sky survey project being implemented in China

urgently needs a system for auto-recognizing M-type stars.This paper presents a novel method that can automatically recognize M-type stars.This method consists of three main steps:First

after a wavelet transform with 5 scales on the spectra in a selected wavelength region

the wavelet features are extracted from the transformed coefficients on the 5th scale.Then

the characteristic frequency of M-type stars and the locations of absorption bands are obtained accurately through the wavelet features.Finally

based on the results of the former step

M-type stars in all kinds of celestial bodies can be recognized.The extensive experiments with real observed spectra show that the proposed method is effective and the correct rate of this method is as high as 97.56%.