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On the basis of a recently derived color-metallicity relation and stellarparameters from the Sloan Digtal Sky Survey Data Release 7 spectroscopicsurvey, a large sample of red horizontal branch candidates have been selectedto serve as standard candles. The metallicity and kinematic distributions ofthese stars indicate that they mainly originate from the thick-disk and thehalo populations. The typical thick disk is characterized by the first grouppeaking at [Fe/H] ~ -0.6, Vrot ~ 170 km/s with a vertical scale height around|Z| ~ 1.2 kpc, while stars with [Fe/H] < -0.9 are dominated by the halopopulation. Two sub-populations of the halo are suggested by the RHB starspeaking at [Fe/H] ~-1.3: one component with Vrot > 0 km/s (Halo I) shows a signof metallicity gradient in the [Fe/H] versus |Z| diagram, while the other withVrot < 0 km/s (Halo II) does not. The Halo I mainly clumps at the inner halowith R < 10 kpc and the Halo II comes both from the inner halo with R < 10 kpcand the outer halo with R > 10 kpc based on the star distribution in the Rversus |Z| diagram.

Metallicity and Kinematic distributions of Red Horizontal-Branch Stars from the SDSS Survey