Dedusting　is　crucial　for　air　pollution　control,　and　nonwoven　needle　felt　(NWNF)　bag-filters　are　widely　applied　for　this　purpose.　Surface　treatment　of　the　filter　materials　can　enhance　NWNF＇s　performance,　but　the　large　discrepancy　in　pore　size　between　the　surface　and　NWNF　layers　causes　interface　effects,　impairing　reverse　cleaning　and　shortening　service　life.　In　this　study,　a　novel　PTFE　membrane-laminated　asymmetrical　composite　bag-filter　was　developed,　by　blending　superfine　polyphenylene　sulfide　fiber　(PPS)　in　the　original　NWNF　structure.　Image　analysis　shows　a　gradual　increase　in　pore　size　from　the　surface　to　the　downstream　layer.　In　standard　lab-scale　tests,　the　novel　M-PPSF-S　filter　showed　moderately　higher　resistance,　significantly　longer　service　life,　higher　dedusting　efficiencies　and　better　cleaning　performance,　compared　to　filters　without　surface　laminating　and/or　superfine　fiber　blending.　Numerical　modelling　was　performed,　and　the　flow　fields　and　pressure　distribution　in　these　filter　materials　were　visualized,　confirming　that　M-PPSF-S　&　PRIME;　unique　structure　facilitated　the　alleviation　of　interface　effect　and　non-steady　flow.　M-PPSF-S　was　further　scaled　up　to　treat　real　flue　gas　from　a　coal-fired　power　plant,　where　constant　good　performance　was　observed　over　5　months.　This　study　offers　a　novel　and　practical　way　to　develop　low-cost,　high-performance　filter　materials　for　high　temperature　flue　gas　treatment.