In　wet　flue　gas　desulfurization　(WFGD)　process,　the　pH　value　of　the　absorption　tower　slurry　is　a　crucial　factor　to　the　efficiency　of　desulfurization　system.　Aiming　at　the　nonlinearity　and　large　lag　of　the　pH　change　in　WFGD　process,　a　predictive　control　strategy　based　on　Hammerstein-Wiener　inverse　model　compensation　is　proposed.　During　the　calculation　of　optimal　control,　an　anti-model　of　Wiener　nonlinearity　unit　is　adopted　to　transform　the　output　setting　values　and　sampling　values.　Similarly　in　the　control　process,　the　controller　output　is　applied　to　the　actual　controlled　object　after　inverse　transformation　of　the　static　nonlinear　Hammerstein　model.　Through　the　above　two　inverse　transformations,　the　controller　output　is　identical　with　the　input　of　linear　link　in　the　closed-loop　system.　In　this　article,　the　inverse　model　compensation　method　is　utilized　to　transform　nonlinear　process　control　into　linear　system　control,　avoiding　the　large　computation　of　nonlinear　model　optimization.　Finally,　the　feasibility　and　effectiveness　of　the　proposed　scheme　are　verified　by　simulation.