Abstract: According to micro thermal imaging, multiresolution displacement estimation based on Fourier transform was put forward. First micro thermal imaging was changed by wavelet transform, and a gray pyramid was built by the wavelet transform of image sequence. And the displacement components of each layer was estimated with Fourier transform. Then the final image sequence displacement was obtained by arithmetic layered weighted mean of all layers. The experimental results show that this method can effectively improve the micro thermal imaging displacement estimation accuracy, and reduce the average error and standard deviation mean.