Aiming　at　the　problem　of　performance　degradation　of　flue　gas　acid-making　control　system　caused　by　system　uncertainty　and　external　interference,　this　paper　presents　a　model　predictive　control　scheme　based　on　an　equivalent　input　disturbance　(MPC-EID)　for　the　temperature　tracking　control　of　flue　gas　acid　production　systems.　First,　a　nonlinear　Wiener　model　is　established　for　the　process,　which　can　well　character　the　nonlinear　change　of　process　temperature.　Second,　design　the　overall　control　strategy　and　complete　the　design　of　MPC　and　EID,　the　observer　estimates　the　equivalent　input　disturbance,　and　compensates　the　estimated　value　in　a　feed-forward　manner　to　obtain　the　final　composite　control　rate　to　achieve　the　rapidity,　accuracy　and　robustness　to　the　disturbance　of　the　reference　temperature　tracking.　Third,　a　rigorous　stability　analysis　shows　that　the　closed-loop　system　is　stable.　Finally,　simulation　and　experimental　results　demonstrate　that　the　MPC　combined　with　EID　method　is　more　efficient　compared　with　MPC　and　MPC-PID　approaches.