  The dynamics of a tachyon attached to a Dvali, Gabadadze and Porrati (DGP)
brane is investigated. Exponential potential and inverse power law potential
are explored, respectively. The quasi-attractor behavior, for which the
universe will eventually go into a phase similar to the slow-roll inflation, is
discovered in both cases of exponential potential and inverse power law
potential. The equation of state (EOS) of the virtual dark energy for a single
scalar can cross the phantom divide in the branch $\theta=-1$ for both
potentials, while the EOS of the virtual dark energy for a single scalar can
not cross this divide in the branch $\theta=1$.
