Using the stellar atmospheric parameters such as effective temperature and metallicity derived from SDSS spectra for \sim 2200 main sequence ( MS ) stars which were also observed by Beijing - Arizona - Taiwan - Connecticut ( BATC ) photometric system , we develop the polynomial photometric calibration method to evaluate the stellar effective temperature and metallicity for BATC multi-color photometric data .
This calibration method has been applied to about 160 000 MS stars from 67 BATC observed fields .
Those stars have colors and magnitudes in the ranges 0.1 < d - h < 1.4 and 14.0 \leq d < 21.0 .
We find that there is a peak of metallicity distribution at [ Fe / H ] \sim - 1.5 in the distance from the Galactic plane |Z| > 5 ~ { } kpc which corresponds to the halo component and a peak at [ Fe / H ] \sim - 0.7 in the region 2 < |Z| \leqslant 5 ~ { } kpc where is dominated by the thick disk stars .
The mean stellar metallicity smoothly decreases from -0.65 to -0.78 in the interval 0.5 < |Z| \leqslant 2 ~ { } kpc .
Metallicity distributions in the halo and the thick disk seem invariant with the distance from the Galactic plane .