This　paper　studies　roadway　network　capacity　by　applying　a　stress　test　method　to　estimate　the　ultimate　limitation　of　the　roadway　network　to　accommodate　the　travel　demand.　The　method　considers　the　factors　affecting　capacity　of　roadway　network　and　defines　the　evaluation　index　of　roadway　operation　quality　-　the　average　degree　of　saturation　of　traffic　flow　and　the　average　speed.　By　using　macro　traffic　simulation　and　planning　software,　the　average　degree　of　saturation　and　the　average　speed　are　calculated　and　compared　in　the　computer.　If　the　results　are　smaller　than　predefined　evaluation　index,　additional　traffic　load　(pressure)　would　be　released　onto　the　network　using　a　regression　based　approach　or　dichotomy　analysis.　The　process　continues　until　the　evaluation　index　is　satisfied　when　the　roadway　network　reached　its　capacity.　This　paper　establishes　the　stress　test　criteria　and　applies　the　method　to　the　Huairou　District　of　Beijing　to　get　its　roadway　network　capacity,　104923pcu/h.　©　2008　IEEE.