As　one　of　important　issues　in　transportation　planning,　capacity　of　road　network　offers　theoretical　support　to　the　quality　evaluation　of　urban　network　in　traffic　control　and　management.　This　paper　investigates　the　capacity　of　road　network　from　a　new　perspective　in　which　the　experimental　traffic　engineering　concept　is　adopted　through　macro　traffic　simulation　and　planning　with　the　Cube　software.　By　considering　the　impact　factors　on　roadway　capacity　and　evaluation　index　system　of　road　network　operational　quality,　we　carried　out　stress　tests　over　the　roadway　network　and　developed　a　process　for　conducting　such　tests.　The　Cube　based　process　was　then　used　in　afield　test　in　the　Huairou　District,　Beijing,　where　the　capacity　of　the　roadway　network　has　been　estimated.