Sesame oil was extracted under different roasting conditions. Then the content of polycyclic aromatic hydrocarbons in sesame oil was detected and analyzed. The results showed that with the extension of the roasting time and roasting temperature, the content of B\[a\]P、PAH4、PAH16 distinctly rose. According to the national standard GB 2716-2005 and the EU regulation No. 835/2011, the reasonable time for roasting sesame should not exceed 30 min, and the roasting temperature should not exceed 180 ℃. When the roasting time is within 30 min and temperature between 200 ℃ and 240 ℃, 3 ring material is easily accumulated; while 4 ring material and heavy polycyclic aromatic hydrocarbons accumulated as the temperature reached 260 ℃.