We review the current status of the study of rotation curve ( RC ) of the Milky Way , and present a unified RC from the Galactic Center to the galacto-centric distance of about 100 kpc .
The RC is used to directly calculate the distribution of the surface mass density ( SMD ) .
We then propose a method to derive the distribution of dark matter ( DM ) density in the in the Milky Way using the SMD distribution .
The best-fit dark halo profile yielded a local DM density of \rho _ { \odot } = 0.36 \pm 0.02 GeV cm ^ { -3 } .
We also review the estimations of the local DM density in the last decade , and show that the value is converging to a value at \rho _ { \odot } = 0.39 \pm 0.09 GeV cm ^ { -3 } .

Key words galaxies : DM—galaxies : individual ( Milky Way ) —galaxies : rotation curve

( Invited review accepted for Galaxies to appear in special issue on ” Debate on the Physics of Galactic Rotation and the Existence of Dark Matter ” )