This　paper　introduces　the　action　mechanism　of　PAM　chemical　and　the　influencing　factors　of　PAM　dosage　for　sludge　dewatering　in　municipal　sewage　treatment　plant,　and　the　PAM　dosages　of　several　sewage　treatment　plants　is　analyzed.　It　is　found　that　the　chemical　dosage　of　sewage　treatment　plant　with　high　concentration　of　inlet　water　is　more　than　that　with　low　concentration　when　the　same　belt　pressure　filter　were　used,　and　meanwhile　the　chemical　dosage　with　belt　pressure　filter　is　more　than　that　with　centrifuge　dewatering　equipment　under　the　premise　of　the　same　inlet　water　quality.　When　the　temperature　is　low,　the　chemical　dosage　is　more　than　that　when　the　temperature　is　high　in　the　same　sewage　treatment　plant.　According　to　the　level　of　temperature　and　the　differences　in　influent　water　quality　and　dewatering　equipment,　the　operators　of　municipal　sewage　treatment　plant　could　select　the　appropriate　model　of　chemical　and　optimize　the　chemical　dosage　to　reduce　costs　in　the　production　process,　through　the　refinement　of　management　and　adjustment　of　equipment　parameters　in　time.　©　Published　under　licence　by　IOP　Publishing　Ltd.