  In this work, we study all the observed $a_2$ states and group them into the
$a_2$ meson family, where their total and partial decay widths are calculated
via the quark pair creation model. Taking into account the present experimental
data, we further give the corresponding phenomenological analysis, which is
valuable to test whether each $a_2$ state can be assigned into the $a_2$ meson
family. What is more important is that the prediction of their decay behaviors
will be helpful for future experimental study of the $a_2$ states.
