  In this work, I studied the spectrum of scalar mesons and axial-vector mesons
via Dyson-Schwinger equation and Bethe-Salpeter equation approach in the
rainbow-ladder approximation. An interaction model with a repulsive term added
to the one used for the pseudoscalar and vector mesons is proposed. My results
are consistent with the experiment data and other model results, which shows
that this interaction model is effective for all the heavy, heavy-light, and
light scalar and axial-vector mesons.
