The　possible　reasons　for　the　invalidation　of　polyphenylene　sulfide　(PPS)　used　in　electrostatic-fabric　integrated　precipitator　were　explored　by　elemental　analysis　and　infrared　spectroscopy　analysis.　Based　on　the　estimation　for　the　acid　solution　concentration　of　the　condensation　of　acid　gases　NOx　and　SO3　at　low　temperature,　a　diluted　acid　with　an　appropriate　mass　fraction　(0%~5%　nitric　acid　and　20%~35%　sulfuric　acid)　simulating　acid　solution　formed　during　the　condensation　process　was　used　to　test　the　anti-corrosion　ability　of　PPS.　The　results　indicate　that　the　main　reason　for　the　degradation　of　PPS　is　the　oxidation　of　PPS　with　the　acid　formed　during　the　condensation.　Compared　to　that　of　H2SO4　and　HCl　solution,　the　oxidation　capacity　of　HNO3　solution　is　stronger,　resulting　in　a　significant　decreasing　to　nearly　20%　of　breaking　strength　retention　of　PPS　after　the　168　h-ageing.　It　could　be　reasonably　inferred　that　reducing　the　dew　point　temperature　of　flue　gas　and　the　NOx　concentration　in　the　gas　is　of　great　importance　in　improving　the　service　life　of　PPS.