Pyrolysis　is　an　effective　method　for　waste　tire　disposal.　However,　it　has　rarely　been　used　to　recycle　specific　highly　valuable　components　(such　as　benzene,　toluene,　and　xylene　(BTX))　from　tire　rubbers,　owing　to　complicated　pyrolytic　reactions.　This　study　investigated　the　pyrolysis　process　of　passenger-car-waste-tires　(PCWT)　with　the　help　of　TG-DTG　and　Py-GC/MS.　Based　on　response　surface　methodology　(RSM),　the　effect　of　pyrolytic　parameters　on　the　yields　of　pyrolytic　oil　and　BTX　is　evaluated.　Furthermore,　the　BTX　generation　mechanisms　are　discussed　from　the　perspective　of　aliphatic　and　aromatic　hydrocarbon　transformations.　Additionally,　pyrolytic　conditions　including　temperature,　rubber　particle　size,　pressure,　and　gas　flow　rate　were　systemically　investigated　and　the　optimum　pyrolytic　condition　for　yield　of　BTX　(26.5　g　per　100　g　tire　rubber)　was　obtained　[765　K,　0.7　mm,　0.52　MPa　and　2.5　mL　(g　min)-1].　Therein,　yield　of　benzene,　toluene　and　xylene　were　1.07,　5.03　and　20.40　g　per　100　g　tire　rubber,　respectively.　During　PCWT　pyrolysis,　BTX　is　primarily　obtained　via　the　Diels-Alder　reactions　of　small-chain　alkenes　and　transformations　of　limonene　and　aromatics.　This　study　elucidates　the　BTX　generation　mechanisms　during　PCWT　pyrolysis　and　clarifies　the　effects　of　varying　pyrolytic　conditions　on　BTX　generation.