The whole sky differential star counts ( DSC ) with 1 degree resolution are retrieved from 2MASS online data service .
Galaxy with double exponential thin and thick disks and a single power law luminosity function ( LF ) is used to interpret the 2MASS data .
The slope of the DSC appears roughly isotropic over the whole sky , the average value is \sim 0.32 , which corresponds to a power law index \sim 1.8 of the LF .
We find that the scale-length and scale-height the thin disk are \sim 3.0 kpc and \sim 245 pc , and those of the thick disk are \sim 3.0 kpc and \sim 780 pc .
The ratio of the thick disk to the thin disk is \sim 7 % .
The location of Sun above the disk is \sim 15 pc .
A comparison of the data and model and their discrepancy are also provided .