  The $\alpha$- decay half-lives of the superheavy nuclei are systematically
studied using different versions of proximity potential and a exact method to
calculate Coulomb potential between spherical and deformed nuclei in the
framework of the double folding model. To reproduce the $\alpha$-decay
half-life, the experimental $\alpha$-decay energy and Wentzel-Kramers-Brillouin
approximation have been used. It is found that the computed values by the
Ng$\hat{o}$ 80 are in good compromise with the experimental half-lives in
comparison with other versions. Also, by using this version and within
$Q_{WS4}$ for determination $\alpha$-decay energies for superheavy elements, we
had predicted the $\alpha$-decay half-lives for superheavy nuclei which have
not been reported yet. The long half-lives with magnitude about $100$ seconds
are predicted for the superheavy nuclei which are not in stability islands
which indicating remarkable stability in comparison with their neighbors. These
results are also in good agreement with the predictions of other semi-empirical
formulas.
