2
\begin{enumerate}
\item item 1
\item item 2
 \item item 3
\end{enumerate}

How to reduce the space between item 1,2,3?

5

Comments have provided good answers. Though one can adjust space between items manually without using any package by setting length \itemsep, for instance:

\documentclass{article}

\begin{document}

\noindent\dotfill

\begin{enumerate}
\setlength{\itemsep}{25pt}
\item item 1
\item item 2
\item item 3
\end{enumerate}

\noindent\dotfill

\begin{enumerate}
\item item 1
\item item 2
\item item 3
\end{enumerate}

\noindent\dotfill

\begin{enumerate}
\setlength{\itemsep}{1pt}
\item item 1
\item item 2
\item item 3
\end{enumerate}

\noindent\dotfill

\end{document}

gives:

enter image description here

Other useful lengths include \topsep, \partopsep, \parsep, etc. For more information, check out source2ε.

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