The multi-beam interference and the CCD camera spectral response, a colorimetric model is established for the interference measurement of lubricating-film thickness. A computation program is built for rendering the interferograms generated by a dichromatic light source in the lubricating-film measurement. For a static ball-glass disc contact, the results of theoretical simulation and experiment of the red-green dichromatic interferograms are agreed. Analyses show that the dichromatic interferogram is mainly influenced by the full width of half maximum (FWHM) of the green-red filter, the thickness of the beam splitter, the spacer thickness and the lubricants. A small FWHM, 4~10 nm of the beam splitter thickness and low spacer thuickness can lead to high contrast of interference fringes.