Based on the newly established high-performance anion exchange chromatography with pulsed amperometric detection( HPAEC-PAD),the saccharides in PM2. 5and PM10 in Beijing from 2011- 2012 were quantified. Fourteen saccharides were synchronously detected in the aerosols samples in Beijing,which can be divided into three categories,i. e. anhydrosugar,sugar and sugar alcohol. Anhydrosugar,coming from biomass burning,include levoglucosan,mannosan and galactosan. Sugar and sugar alcohol,emitted by the primary biog...