The stellar metallicity distribution of the Galaxy from the BATC survey

Using ~2200 BATC main sequence (MS) stars which include SDSS stellar atmospheric parameters, we develop the polynomial photometric calibration method to evaluate the stellar effective temperature and metallicity for BATC data. This calibration method has been applied to about 160 000 MS stars. The mean stellar metallicity smoothly decreases from -0.65 to -0.78 dex in the interval 0.5 < |Z| <= 2 kpc. Metallicity distributions in the halo and the thick disk seem invariant with the distance from the Galactic plane.