  In this article, we study the strong interaction of the vertexes $\Sigma_bNB$
and $\Sigma_c ND$ using the three-point QCD sum rules under two different dirac
structures. Considering the contributions of the vacuum condensates up to
dimension $5$ in the operation product expansion, the form factors of these
vertexes are calculated. Then, we fit the form factors into analytical
functions and extrapolate them into time-like regions, which giving the
coupling constant. Our analysis indicates that the coupling constant for these
two vertexes are $G_{\Sigma_bNB}=0.43\pm0.01GeV^{-1}$ and
$G_{\Sigma_cND}=3.76\pm0.05GeV^{-1}$.
