  In this paper we calculate the Galactic positron flux from dark matter
annihilation in the frame of supersymmetry, taking the enhancement of the flux
by existence of dark matter substructures into account. The propagation of
positrons in the Galactic magnetic field is solved in a realistic numerical
model GALPROP. The secondary positron flux is recalculated in the GLAPROP
model. The total positron flux from secondary products and dark matter
annihilation can fit the HEAT data well when taking a cuspy density profile of
the substructures.
