A simple method based on microwave extraction coupled with gas chromatography-mass spectrometry was developed for the determination of trace amounts of phthalates esters（PAEs） in environmental particle matter（PM2.5）.The sample was extracted with ethyl acetate-acetone mixed solvent by microwave-assisted extraction.The PAEs were separated on a DB-5MS column and detected by MS under SCAN/SIM mode.The external standard method was used for the quantification.The linear ranges for the calibration curves of PAEs ranged from 100 pg to 1 000 pg.The limits of detection（MDL） ranged from 0.101 ng/m3 to 0.262 ng/m3.The spiked recoveries were in the range of 81.6%-129%.The particle matters of ambient air in the Changzhou chemical industry park were successfully analyzed using the proposed method.15 PAEs were detected in the sample.The concentrations of diisobutyl phthalate（DIBP）,dibutyl phthalate（DBP）,dioctyl phthalate（DEHP） were high.The results showed that this would be a valuable method for the PAEs analysis in particle matter of ambient air.