In　limestone-gypsum　wet　flue　gas　desulfurization　process,　the　change　process　of　pH　value　of　slurry　in　absorption　tower　is　a　typical　nonlinear　system　with　time　delay　and　various　uncertainties,　so　it　is　difficult　to　establish　an　accurate　mathematical　model　of　slurry　pH　control　process.　According　to　the　pH　control　process　of　the　slurry　of　wet　flue　gas　desulfurization　process,　a　model-free　adaptive　control　algorithm　based　on　compact　form　dynamic　linearization　(CFDL-MFAC)　is　designed　to　realize　the　tracking　control　of　the　pH　value　of　the　slurry.　Due　to　various　interference　factors　in　the　pH　control　process　of　slurry　in　absorption　tower,　it　is　easy　to　cause　jump　change　of　control　system　parameters　and　even　structure.　Therefore,　a　model-free　adaptive　control　algorithm　based　on　switching　strategy　is　proposed　in　this　paper.　According　to　different　working　conditions,　several　model-free　adaptive　controllers　are　established.　The　stability　of　the　algorithm　is　analyzed　for　the　two　cases　of　fixed　system　parameters　and　jumping　system　parameters.　It　was　found　that　the　model-free　adaptive　controller　based　on　the　switching　strategy　can　switch　multiple　controllers　under　the　condition　of　system　parameter　jump,　so　as　to　realize　the　fast　tracking　control　of　the　slurry　pH　value　of　the　system　absorption　tower　under　different　working　conditions.　Through　this　method,　the　overshoot　can　be　reduced　and　the　control　quality　can　be　improved.