The chromatic confocal method for displacement measurement is described in the paper. Some factors that affect measuring precision and measuring range are discussed, which include diameter of detector pinhole, spectrum width of light source, the chromatic dispersion of lens, the resolution of spectrum analyzer, data processing method, etc. The objective lenses with different chromatic dispersion using in the experiment system are designed and manufactured. The method processing spectrum line received from spectrometer is studied and corresponding program is compiled. The experiment system is composed of a light resource with continuum spectrum, an object lens (a multi-lens optical system), two pinholes, a beam splitter and a spectrum analyzer. The experimental systems with different lenses (different chromatic aberration) are calibrated separately to determine the relationship between the received wavelength and corresponding distance to target surface.© (2010) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.