FTP(Fourier Transform Profilometry) is an important method in measuring surface appearance of 3-D object,and 1-D Fourier transform can be used for phase demodulation of normal surface,but it is sensitive to high frequency noises and low frequency background noises.2-D Fourier transform can be realized by continuous utilizing of 1-D FTP or 1-D reverse FTP,and 2-D frequency spectrum analysis to separate and obtain 3-D useful information is carried out by 2-D FTP.The experiments show that 2-D FTP can remove gray degree change along non grating line and high frequency noises.By reducing fluctuation along Y axle,it can display more details of 3-D objects to improve precision of phase demodulation.