  We consider the massive Dirac-Klein-Gordon system in two space dimensions.
Under the non-resonace mass condition, we show that the solution is
asymptotically free if the initial data are sufficiently small in a suitable
weighted Sobolev space. In particular, it turns out that the Dirac component of
the DKG system tends to a solution of the free Dirac equation. Our proof is
based on the algebraic normal form method.
