  The partial widths of the decays $D^+_s \to \phi \pi^+$ and $D^+_s \to \pi^+
\pi^+ \pi^-$ - nonresonant are computed within the effective quark model with
chiral symmetry involving Heavy quark effective theory (HQET) and Chiral
perturbation theory at the quark level (CHPT)$_q$ with linear realization of
chiral U(3) x U(3) symmetry. It is shown that for the explanation of the
experimental probability of the $D^+_s \to \pi^+ \pi^+ \pi^-$ - nonresonant
decay one does not need to use unnaturally heavy light current quarks as has
been suggested in Ref.[1]. The life time of the $D^+_s$ - meson $\tau_{D^+_s} =
(0.59\pm 0.19) x 10^(-12) s$ is computed in good agreement with the
experimental one.
