Most of known RR Lyraes are type ab RR Lyraes ( RRLab ) , and they are the excellent tool to map the Milky Way and its substructures .
We find that 1148 RRLab stars determined by Drake et al .
( 2013 ) have been observed by spectroscopic surveys of SDSS and LAMOST .
We derived radial velocity dispersion , circular velocity and mass profile from 860 halo tracers in our paper I .
Here , we present the stellar densities and radial velocity distributions of thick disk and halo of the Milky Way .
The 288 RRLab stars located in the thick disk have the mean metallicity of [ Fe/H ] = -1.02 .
Three thick disk tracers have the radial velocity lower than 215 km s ^ { -1 } .
With 860 halo tracers which have a mean metallicity of [ Fe/H ] = -1.33 , we find a double power-law of n ( r ) \propto r ^ { -2.8 } and n ( r ) \propto r ^ { -4.8 } with a break distance of 21 kpc to express the halo stellar density profile .
The radial velocity dispersion at 50 kpc is around 78 km s ^ { -1 } .