Abstract: A broadband (white-light) interferometric detection method based on the Michelson interferometer principle was put forward to detect the phasing error between the segmented mirrors, and subsequently correct the misaligned segments correspondingly to achieve mirror coplanarity. The phase error between the segments was extracted from the interferograms mismatching. Double-center-wavelength combinations of broadband light sources were applied to raise the center-fringe visibility. Theoretical simulation was carried out to compare different center-fringe visibility for different wavelength combinations. The result shows that the application of the double-central-wavelength combination is effective in raising the ability of signal distinguishing of the white-light center-fringe, improving the m