Flue gas recirculation sintering process is a new sintering method that reutilizes partial flue gas that produced by the sintering machine as the input gas. It has been regarded as dual benefit to save energy and reduce emissions. In this paper, technological characteristics of five typical recirculation process of sintering flue gas are introduced, which are waste gas regional recirculation process, EOS, LEEP, EPOSINT process, and BSFGR process. Subsequently, according to the application benefit of each process, the application status is analyzed. Lastly, according to the actual situation no matter how the sintering flue gas desulfurization or denitrification equipment is or will be constructed, different flue gas recirculation process models are introduced to choose.