Mixed　traffic　is　one　of　the　most　remarkable　characteristics　of　transportation　in　Chinese　cities.　In　order　to　study　the　phase　strategies　of　urban　signalized　intersection　and　carry　out　the　mixed　traffic　simulation　of　the　intersection,　this　paper　proposes　a　novel　definition　of　the　mixed　traffic　order　based　on　the　＂time-space　resource　using＂　of　the　intersection,　and　establishes　the　mixed　traffic　order　model.　It　proposes　the　conflicting　area　model　based　on　the　space　resource,　and　the　conflicting　time　model　based　on　the　time　resource　of　the　intersection,　and　the　order　degree　of　the　mixed　traffic　is　taken　as　a　new　index　of　evaluation　for　the　signal　control　optimization.　Finally,　it　takes　the　order　degree　and　the　vehicle　delay　as　the　indexes　of　evaluation　for　the　optimization,　uses　the　simulation　method.　A　real　signalized　intersection　is　illustrated　to　get　the　optimal　strategy,　and　it　gets　an　optimal　result　after　an　optimal　process.　The　result　indicates　that　the　optimal　strategy　evaluated　by　the　order　degree　of　mixed　traffic　and　the　vehicle　delay　is　better　than　the　former　strategy　evaluated　by　the　vehicle　only,　and　it　fits　to　describe　the　mixed　traffic　phenomenon　of　China.