  Directional detection of dark matter is the next generation experiment, which
is expected to have better back ground rejection efficiency than conventional
direct search. Another intriguing possibility of the experiment by means of the
directional information is measurement the velocity distribution of dark
matter. Especially, it will be potent to figure out whether the velocity
distribution is anisotropic. Supposing three distribution models, we discuss
the possibility in one of the directional dark matter searches, nuclear
emulsion detector.
