A GC-MS method for simultaneous detection of 10 kinds of phthalates was developed. DEHP and DIBP were detected in 5 kinds of tear tapes for cigarette packaging, and the contents were determined using the method. The phthalates was extracted with hexane by ultrasonically assisted procedure and ASE method respectively. The recoveries of the phthalates are between 70. 8% ~91. 7% with relative standard deviations of 7. 95% ~9. 82% when dealing with the ultrasonically assisted procedure, and between 82. 2% ~ 93. 8%% with relative standard deviations of 4. 95% ~ 7. 87% by the ASE procedure. It was concluded that the ASE procedure is the better pretreatment of tear tape for cigarette packaging.