  A space $X$ is called a $k_{R}$-space, if $X$ is Tychonoff and the necessary
and sufficient condition for a real-valued function $f$ on $X$ to be continuous
is that the restriction of $f$ on each compact subset is continuous. In this
paper, we mainly discuss the $k_{R}$-property on the free topological groups,
and generalize some well-known results of K. Yamada's in the free topological
groups.
