The　high　contents　of　AAEM　(alkali　and　alkaline　earth　metals)　and　sulfur　in　zhundong　coal　result　in　more　fine　particulate　matter　during　coal　combustion.　In　this　paper,　the　emission　of　fine　particulates　from　zhundong　coal　riched　in　AAEM-sulfur　and　zhunnan　coal　riched　in　aluminum-silicon　was　investigated　in　a　drop　tube　furnace.　Co-combustion　of　zhundong　coal　and　zhunnan　coal　was　further　investigated　to　study　the　effect　of　interaction　among　different　elements　in　coal　on　the　PM　formation.　The　size　distribution,　concentration　and　composition　of　the　particulates　were　analyzed　by　low　pressure　impactor　(DLPI)　and　scanning　electron　microscopy　(SEM).　The　distribution　of　sodium,　magnesium,　calcium,　iron　and　sulfur　in　fine　particulates　and　their　effects　on　the　generation　of　fine　particulates　were　obtained.　The　results　show　that　the　fine　particulates　from　AAEM-sulfur　rich　coal　combustion　mainly　consist　of　sulfates　and　oxides　of　AAEM.　The　amount　of　fine　particulates　from　burning　aluminum-silicon　rich　coal　decreased　significantly.　The　composition　of　PM0.4　and　PM0.4+　are　significantly　different.　Co-firing　of　AAEM-sulfur　rich　coal　with　aluminum-silicon　rich　coal　has　an　obviously　synergetic　effect　of　reducing　the　fine　particulates　emission.　The　capture　of　AAEM　and　iron　by　aluminum-silicon　compounds　plays　an　important　role　in　PM10　reduction　during　blended　coal　combustion.　The　change　of　sulfur　content　in　PM0.4　is　consistent　with　the　change　of　AAEM　content.