The　pyrolysis　of　passenger-car-waste-tires　(PCWT)　has　recently　attracted　widespread　attention　because　it　is　a　highly　effective　disposal　method.　However,　a　comprehensive　understanding　of　real　tire　pyrolytic　processes　is　limited　owing　to　the　complicated　PCWT　pyrolysis　reaction　system,　particularly　regarding　the　reaction　mechanism.　This　study　investigated　the　PCWT　pyrolytic　processes　using　a　thermogravimetric　analyzer　coupled　with　mass　spectrometry　and　analyzed　all　the　pyrolytic　products　using　pyrolysis-gas　chromatography　coupled　with　mass　spectrometry.　The　composition　and　distribution　of　the　PCWT　pyrolytic　products　were　investigated　under　a　kinetic　regime　to　eliminate　other　influences　on　the　intrinsic　reaction.　The　pyrolytic　products　mainly　consisted　of　chain　and　cyclic　alkenes,　and　monocylic　aromatics.　Importantly,　an　integral　pyrolytic　mechanism　network　for　the　PCWT　was　established　based　on　the　pyrolysis　of　single　rubbers　(natural,　styrene　butadiene,　and　butadiene　rubbers).　The　reaction　routes　for　the　main　products　were　determined　according　to　the　mechanism.　Moreover,　a　kinetic　study　of　the　PCWT　pyrolysis　revealed　the　activation　energy　for　this　complicated　reaction　system.