  In this article, we study the Schr\"{o}dinger-Newton equation
\begin{equation} -\Delta u+\lambda u=\frac{1}{4\pi}\left(\frac{1}{|x|}\star
u^{2}\right)u+|u|^{q-2}u \quad \text{in}~\mathbb{R}^3, \end{equation} where
$\lambda\in\mathbb{R}_+$, $q\in (2,3)\cup(3, 6)$. By investigating limit
profiles of ground states as $\lambda\to0^+$ or $\lambda\to+\infty$, we prove
the uniqueness of ground states. By the action of the linearized eqaution with
respect to decomposition into spherical harmonics, we obtain the nondegeneracy
of ground states.
