The non reaction dynamics of Ar+HF (ν′,J′)→ Ar+HF (ν″,J″) has been studied based on the analytical potential energy function of ArHF (X 1Σ +) using the quasiclassical Monte Carlo trajectory. It is reasonably found that the populations of rotational levels, particularly, for higher J values, are remarkably relaxed, however, it is not effective for the vibrational levels of HF.