  We study the concentration phenomenon for solutions of the fractional
nonlinear Schr\"{o}dinger equation, which is nonlocal. We mainly use the
Lyapunov-Schmidt reduction method. Precisely, consider the nonlinear equation
\begin{equation}\label{e:abstract}
(-\varepsilon^2\Delta)^sv+Vv-|v|^{\alpha}v=0\quad\mbox{in}\quad\mathbf R^n,
\end{equation} where $n =1, 2, 3$, $\max\{\frac{1}{2}, \frac{n}{4}\}< s < 1$,
$1 \leq \alpha < \alpha_*(s,n)$, $V\in C^3_{b}(\mathbf{R}^n)$. Here the
exponent $\alpha_*(s,n)=\frac{4s}{n-2s}$ for $0 < s < \frac{n}{2}$ and
$\alpha_*(s,n)=\infty$ for $s \geq\frac{n}{2}$. Then for each non-degenerate
critical point $z_0$ of $V$, there is a nontrivial solution of equation
(\ref{e:abstract}) concentrating to $z_0$ as $\varepsilon\to 0$.
