Based on fourier transform profilometry(FTP),a new method is proposed for extracting the fundamental frequency information of the original grating pattern from its deformed grating pattern and reconstructing the original grating pattern.Firstly,the functions of original grating pattern and reference plane are described,and the relation between original grating pattern and its deformed grating pattern is revealed.Then the spectrum distribution of the deformed grating pattern is analyzed by use of 1-D dilating Gabor transform,and the fundamental frequency information is distinguished and extracted from the spectrum.Finally,a full original grating pattern is reconstructed to realize 3-D shape measurement.Experimental results show the validity of the above method.