This　paper　develops　a　new　theoretical　system　of　Experimental　Traffic　Engineering　Method　(ETEM)　to　provides　the　theoretical　support　for　studying　the　complex　giant　system-transportation　system.　The　necessity　of　research　on　ETEM　theoretical　system　is　proposed;　the　development　course　of　ETEM　is　introduced;　the　concept　of　ETEM　theoretical　system　is　defined;　the　construction　of　ETEM　theoretical　system　is　also　studied　and　analyzed.　Based　on　above　study,　the　theoretical　framework　of　ETEM　has　been　established　initially.　The　establishment　of　theoretical　system　is　designed　to　carry　out　classification　research,　to　emphasize　the　focus　of　study,　and　to　specify　the　interrelations　of　all　theories.