  Iron-based superconducting layered compounds have the second highest
transition temperature after cuprate superconductors. Their discovery is a
milestone in the history of high-temperature superconductivity and will have
profound implications for high-temperature superconducting mechanism as well as
industrial applications. Raman scattering has been extensively applied to
correlated electron systems including the new superconductors due to its unique
ability to probe multiple primary excitations and their coupling. In this
review, we will give a brief summary of the existing Raman experiments in the
iron-based materials and their implication for pairing mechanism in particular.
And we will also address some open issues from the experiments.
